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I absolutely love this thing. I had a bunch of friends who owned it, so I decided to try it out. I immediately ordered another one. I've worn this layer about 75% of the days that have elapsed since I got it. It's super comfortable and warm but breathes well and is not too thick. One of my favorite pieces from Patagonia, and I own a lot o... Read Moref pieces from Patagonia.
I also have the front zip hoody version, which is very adaptable to all sorts of conditions, and layers well, but there is a bit of bulk around the neck when the hoody is down. The crew is the perfect minimalist alternative - clean around the neck, no zips. You can wear a close fit t shirt underneath but that is it. Wearing it , it feels more like ... Read Morea super beefy long sleeve T than a sweater.
Really nice fleece and a great cut. I love the crew look. Its a true slim fit - I am 5 9 150 and a medium fits perfectly. One star off because I wish the neck hole was a little tighter, may be personal preference though.
I was looking for a fleece layer that was warmer than mid weight, was light and warm with no zipper or collar. Warmth to weight is great, hence the name Air. No collar or zipper stacking when layering. Small functional L breast zippered pocket. Other reviews said runs small so I sized up to XL for wearing over another layer. That worked out good fo... Read Morer me at 195 lbs with decent shoulders and chest. Used it skiing under a hard shell, fishing with an SST, on the airplane and just lounging. Not excited about the contrasting pocket colors, so I got black which is my go to anyway. Very happy
I deliberately got the new Salt color one size larger than usual for 3 reasons: First, it's a trim fit, but I wanted it a little floppy for just slubbing around. Second, I wanted to be able to toss it on over a t-shirt. Third, i wanted to use it as an outer-grament, not a base layer. The Salt color with Yellow trim is a nice, casual scheme for... Read More Summer; and in real life, it's FAR more attractive than in the pictures here. I fully intend to get this garment in a darker color for the Fall & Winter. It's cozy across a wide range of temperatures; and you can even sleep in it - "been there/done that" LOL.
I run exclusive Patagucci and love all their gear but this might be my favorite. Lightweight, versatile and feels great on bare skin. A must have for anyone outdoors or in the mountains.
Im 6 foot and athletic build (garage CrossFit non-Kool aide guy here) & surf build. I had an issue initially with the original M fitting tight around shoulders and upper arms. But I exchanged for another M that fit perfectly (weird) and was able to fit a t-shirt comfortably underneath.
Its working well for Socal and gets toasty when hiking in... Read More 50s. Its a dope purchase. Also have the hoodie but tha one fit excellently in M
Ordered a size up for hubs who has a dad bod physique; that was the correct choice for both comfort and layering. He has worn it several times for outdoor cold weather work like shoveling/snow blowing in comfort in the North as well as casual/work wear and gotten many compliments on it. He was very pleased with the length in both the body and sleev... Read Morees which tend to be trouble spots for him given his long torso and ape arms.
If you're more slender, I would suggesting ordering your usual size.
I have several pieces of the R1 Air with the zig zag pattern. They are warm, fit snugly, and are extremely comfortable. I use them for my mid layer on my daily walks. This morning air temperatures were -13 F, and I immediately reached for my R1 Air. It kept me warm without excessive bulk. If I happen to see other articles of Patagonia clothing that... Read More are made in the same style and manner as the R1 Air, I will buy it because it works well for me.
This is another great sweater that I switch off to from fleece. This is super soft and attractive for work and casual. Great layer under down jackets. I wear XL in everything but XXL is this particular pull over. One of the better priced pieces.
When I got this I didn't really think it was going to be warm, but I was very happy to see that I was wrong. The R1 is one of the warmest pieces of clothing I have, I love that I can just wear it as is or layer something over it. I have used it or everyday use, hiking, and working out and the holds up very well. If you are a muscular person, t... Read Morehe R1 will accentuate your muscle which is pretty rad. My only knit pick is that the front pocket not that great due to its small size, but its better than nothing!
This is my 3rd! Two others are the zip-neck (1/4 zip). I LOVE the 1/4 zip as it fits perfectly! (6ft/170lbs). The crew is a bit smaller but should be great when I lose the holiday weight! Warm, comfy, professional enough for work (high school teacher) and casual enough for camping.
Wish it came in a tall option and the length and sleeves were a little longer
My boyfriend wanted this for his birthday so I bought him the black one. He's a thin 6 foot one inches and the medium fit him best. It is just too bad there isn't a tall option because the sleeve length and overall shirt length are a bit short on him. He's determined to stretch it out and wanted a second one for Christmas so I got hi... Read Morem the blue, which is a nice color.
This crew fleece is great! I find it very comfortable and breathable. I really enjoy it. My only complaint is that I ordered two in large (green and oar tan), but, the one in oar tan is clearly not the same size as the green one. The green one fits about like i expected but the oar tan one must be a medium with a large tag on it. It's not even... Read More close to the same fit. Which is a bummer because I really like the color.
We're glad to hear your feedback on the fabric and comfort. We'll reach out to you to discuss options for a return or exchange on the ill-fitting fleece top under our [Ironclad Guarantee](https://help.patagonia.com/s/article/Ironclad-Guarantee). Thanks for taking the time to send us a review Devin!
November 12, 2022
High warmth to weight ratio.
Performance fit for under a shell. Warm and lightweight. Very comfy. Serves many purposes.
Used this past weekend on a backcountry fishing mission in the Greater Yellowstone area. Incredible mid/baselayer that breathed very well while trekking, and kept me warm while layering for fishing.
The best thermal top I've had so far. Made for cooler to very cold temps and vents very well to reduce sweating. I'm a avid hunter and it's a excellent addition to my gear!
Love the fit and feel, hugs your body but not too tight. Allows motion and vents extra heat during active periods. Overall I love the product and would recommend it.
The R1 material is the best in comfort, fit, warmth, breathability, and application that Patagonia offers. Worn by itself, or in layer, the R1 is hands down best baselayer I've tried, anywhere. I have in mulch brown, palo green, and black. You must try it out, you'll be very impressed.
This top is extremely soft and warm. It doesnt work well for me as an outer layer because almost every piece of debris sticks to it. However, as an inner or base layer its very warm, flexible and breathable.
Bought this for my daughter during the sale, she has been teaching skiing all winter and needed another base layer, the women's were all sold out so we got a Mens Medium. It fits well, a little looser in mid section than a woman's would be but works with another layer under, or alone as well. Love the front pocket, and it is oh so soft!
510 185lbs large is perfect!! So far Ive worn cross country skiing both as a baselayer under a soft shell on cold days (10-20°F) and over a light baselayer on warm days (30-35°F). Running in temps up to 50°F seems great. Breathes well! Dries quickly. Its a great blend of technical material with a classic, casual look. Ive work it to work, at home a... Read Morend everywhere. New favorite mid for all seasons.
It is warm, and way puffier than what I thought I was buying. It looks lighter in color and fabric than what it actually is. Not a "heavy" long sleeve t-shirt, rather a full on fleece. Not a bad product at all, just not what I was looking for
Thank you for taking the time to share your review, Stefano. We're sorry to hear this R1 Air Fleece wasn't what you expected! Yes, it's a pretty beefy fleece. If it's not going to work for you, we'll be happy to help you [return](https://www.patagonia.com/returns.html) it. Please let us know how we can help!
March 18, 2022
Perfect Sweater for lounging, casual wear
Very warm, comfortable, and love that this is slim fit. Patagonia doesn't offer a lot of slim fit clothes but when they do, the item is excellent. Fleece is great material. Just got the sweater so let's hope it lasts (I used to own a Better Sweater and the fleece on that is awful).
Hi Kayla, we're so bummed to hear that there's consistently been an issue with sizing. Please feel free to take advantage of our [complimentary exchanges](https://www.patagonia.com/returns.html) to grab the correct size.
March 16, 2022
Last mid-layer Ill ever need!
I love my R1 Air! I wear it over a merino base layer and under my shell and Im warm all day skiing. It breathes and even feels soft next to the skin.
Fleece sweaters are ideal for cold weather
Air, interlayer provides warmth and air permeability, in addition to wear resistance
And weather resistance, can be extended in changing mountain conditions multi - work
Flexible, double woven fabric clinging to skin, soft and warm!
I run very hot while touring and this layer is what I have been dreaming of. I could *see* how breathable this was at pulling moisture off of my skin while I stayed just the right temperature on the inside.
We appreciate your feedback, Nicholas! If the "slim" fit design of the R1 is constricting at all, we recommend checking out our slightly more roomy ["regular" fit fleece tops](https://www.patagonia.com/shop/mens-fleece?prefn1=fit&prefv1=regular). We'll be happy to exchange that for you!
March 14, 2022
Go to layer
I have worked outside in the ski industry for nearly 40 years and layering is important each and every day. The crew neck design is important for me too. After all, how many layers of collars can be worn? This shirt is light, warm and quick to dry. It just may be my new favorite.
The Patagonia Men's R1 Air Fleece Crew is just the right amount of breathability and warmth for light hiking and also works well for layering during very cold weather. Im 198 and 62 and the large fit perfect.
I have many R-1 but this is my first crew, this is a great choice when I am going to have multiple layers with zip up neck. This workhorse is a great layering piece that keeps warm when idle and dry during aerobic efforts by wicking away moisture. Love that it is recycled!
I was a little skeptical about this pullover but turns out I love it. The pocket fabric is really nice and light weight (which was a concern having not seen one in real life) and the fabric is soft enough to be a base layer but the piece can also be used as ones on again off again layer. As with most active tops/jackets, I chose the mens due to lan... Read Moreky build and I recommend that to any other females who are on the fence about Ms or Ws. I consistently get a better fit in a mens (small, in my case), versus a womens (large, which is just too boxy for my build).
Im 60 and weigh 150 lbs. Ive always been a size small in Patagonia and prefer a trim fit. This was too short in the torso, too short in the arms, and too snug to fit a base layer under. I love the fabric and was really hoping this would work out as a mid layer for winter sports, but the fit just didnt work. Looking at measurements, the medium was n... Read Moreot any longer in the arms. Sadly, this wasnt made for me.
Hi Olivia, thank you for taking the time to write us a review. We're really sorry to hear that the fit didn't work for you. This feedback is helpful both to other customers and to our product team for improving products for future seasons. We want you to be happy with everything you purchase from us, and if you like we'll be happy to help you [return](https://www.patagonia.com/returns.html) it.
I use this primary for walking and hiking. It is lightweight and warm which is exactly what I was looking for. Very comfortable and makes a great liner if you need an outer shell for wind/rain. I love it so much I bought one for my son.
Been running this as a base layer during early season skiing here in Mammoth. Super warm, comfortable, and pretty much all I need under a shell down to 30°. The chest pocket is good for small items like keys or lip balm, but too small for a phone. I run hot but never sweat this piece out, not sure what kind of voodoo magic Patagonia has conjured up... Read More here, but I like it.
58 141. Small in all Patagonia items. The R1air is heavier and warmer than the wool/capilene regular air. It breaths well for its weight but its not as breathable as the regular air. It does block more wind than the regular air. It is looser and has more of a sweater fit than baselayer fit, I prefer the looser fit as it does not ride up on you, It ... Read Moreis not so loose that it bunches up under my pack straps.I can tuck it in or leave it untucked. Its very comfortable next to skin. I dont feel any seams or extra material.
I have not worn it 5 days in a row, so the stink factor has yet to be tested, The regular air can go weeks without smelling,
My only concern is that it does not stretch a ton and this might be a long term issue with durability at the seams. But it's a Patagonia and Its IRON CLAD.
5 ft 10, 175 lbs. Originally bought a size medium (I have an older r1 pullover in medium and it fits fine) and found it fit pretty well everywhere except it was tight in the armpits. Like "I can't wait to take this off" tight.
I exchanged it for a Large and it fits much better. It's a little long in the arms and waist, but it&#... Read Morex27;s not too bad. A little surprising as this is one of the few articles of clothing I own in a Large now.
I really like the R1 air fabric. Really cozy and warm - a lot warmer than I expected based on the weight and noticeably warmer than my regular R1 fleece with the grid pattern. I'll probably buy a zip neck or hoody in the near future.
Someone must have lost their liver to eagles to bring this to us. It's almost got an electric heat to it yet is super breathable. Paired with a moisture-wicking layer underneath I'm thinking you could feasibly survive up to -210ºF. Long story short, it's exactly what you'd hope a warm active fleece would be. It fits like a base ... Read Morelayer though so size up.
Bodies come in all shapes and sizes, but this is pretty close to perfect for me. I'm 5'10" and 180 lbs. The Better Sweaters were always a bit baggy on me. So far, the R1 Air feels great and is perfect for getting around in 50 to 60 F weather. We'll see how long it takes for the cuff to become stretched out. My one complaint is t... Read Morehat the hem tends to ride up with normal activity, so I'm tugging at it throughout the day. It'd be nice if it didn't do this, or if the garment was a touch longer.
Great fit and a really functional layer. Does a good job of wicking away moisture during high exertion. This is my favorite layer for all forms of skiing. Layers well and does its job.
I bought this knowing medium would be a bit snug for my 511, 160lbs body, and it fits like I wanted it to. Much less tight than capilene thermal hoodie, but still form fitting. I wear it on its own (over a t shirt), or I can put a loose fitting flannel shirt over it. Its good as an athletic layer as well as a casual top, and I love this versatility... Read More.
Im an athletic lady; tall and wider shoulders. Patagonia womens XL doesnt fit comfortably and definitely wouldnt in a Slim Fit item. This fits me comfortably and gives me room to move. I have found it to be warm, soft and unfortunately a bit of a pet hair magnet, haha. Definitely recommend and, for me, it seems better than previous iterations of th... Read Moree R1.
I got an R1 a bit ago and went with a large and it's great when climbing as it's long enough to comfortably be under the harness but otherwise feels like a dress. I went with a medium for this one and it's significantly shorter than I expected and I can't fit any layers under it comfortably. It's also incredibly tight in my... Read More armpits. I was disappointed by how excited I was to take it off when the day warmed up. I think I would like it more if it was larger, but I am perpetually confused by patagonia's inconsistent sizing.
Hi Alex, please feel free to begin a return or exchange for the size up in your R1® Air Fleece Crew. We want you to be comfortable in your gear and able to move with ease. You can start your return or exchange here, https://www.patagonia.com/returns.html.
October 3, 2021
Layer it or apre in it!
I bought this to wear as a comfortable warm casual long sleeve but can also use in lift days in the hill under a vest.
A perfect fit, perfect look, and perfect temp regulation.
I feel like I'm kinda in-between sizes with most Patagonia tops so I size up to a medium. While not a form fitting top it is indeed a slim fit which looks perfect on me. I got it in brown. The comfort and mobility are excellent as well. I find it breaths exceptionally well and is suitable for a wide range of temps. On a recent camping trip I b... Read Moreasically wore it for three days straight. The crew cut makes for the most stylish fleece I've ever had. It's probably the nicest top I own and I can't wait to wear it to work in the fall. I like it so much I might pick up the green color as well.
I love R1 Air Fleece Fabric. But I also love my sweatshirts to be baggier, slouchy, and relaxed. I am 5'10" 165lbs and have a 39in chest. So, I fit in a medium, but I wish I had sized up for a baggier fit. The medium size will work wear as a midlayer under a shell though, but if I want to wear this as a casual outer layer, I am gonna need... Read More to size up. I will probably be buying another, despite already having a hoody and the crew! Thanks Pat.
This is a great piece of gear that I am looking forward to wearing in cold weather for a JMT thru hike. Clearly warm and breathable at the same time. My complaint is the lack of a tall size offering. I had to order an XL to get sleeves that are anywhere nearing enough, but the fit is a little baggy. Im a sleeve 36/37, and the XL is 2 inches too sho... Read Morert in the sleeve but too wide in the chest (Im a 44 chest). Would be happier if Patagonia offered a tall option for their clothes.
I appreciate the quality of Patagonia products, but I dont consider myself a homer and I am not afraid to call them out if needed. For instance, their on-line shopping experience/website is horrible. I also dont think they have good options for mens hiking pants. They simply arent comfortable. However, I LOVE their R1 products and the R1 Air Crew i... Read Mores no exception. It is soft, comfy, fits well and looks good. It also breathes well. Despite what I was told the R1 Air is NOT as warm as the straight R1 versions, but it breathes better. I suspect it could be susceptible to snagging so you will have to be careful. Thats the price you pay for having a softer feel than a Tech Face finish. Highly recommend it if you are looking for a comfy medium weight top.
Im on the border between L and XL and sizing up is appropriate for this one. Feels great on. Its worth noting it has a pretty wide collar. The sleeves have a nice taper that I wish was used on other shirts.
I have been wearing R1 and R2 products for years. This was the first time I tried a crew collar design. I didn't like the fit, feel or appearance and retuned it and ordered the 3/4 zip R1 version with a tall collar and really like it. Very comfortable and easy on/off.
The R1 crew is very comfortable. I find myself wearing it all the time inside and outside. For the fabric weight, it does a better job of keeping me warm compared to other similar weighted Polartec products so you stay warmer with less bulk. The sizing guide stated that this crew was slim fit and it was true to size. I wanted a little looser fit so... Read More I ordered the next size up and it fits great. I liked it so well I also bought the Patagonia R1 full-zip hoody.
To be frank, good base layers aren't that hard to find--Patagonia, obviously, makes great baselayers, but so do REI, SmartWool, etc. What sets this apart is its versatility. Yes, it's a great base layer out in the field--it keeps me super warm in camp, dries quickly, does a great job suppressing human funk, and is super packable/light wei... Read Moreght, but it's also a piece that I wear around the house or out on the town. I've only owned this crew for a month so this isn't a long term review--but I'm loving it so far.
One of my favorite things about this crewneck is how quickly it drys. I typically run with a tshirt under my r1s, but with this Id rather just wear without another shirt because of how warm and quickly it drys. Super impressed with this product, and would definitely recommend!
The reviews on the R1 air crew peaked my interested so I ordered the Mulch Brown colorway. The color was exactly what I expected in person so that was nice. The size is true to size, I was worried it was going to be too short in the body but it hits at a good length. I wasn't sure if I would keep it at first but after trying it on and wearing ... Read Moreit around the house I ended up loving it. It's great with pet hair and holds up to clawing and scratching from our two cats. The sleeves could use a resigned cuff that would stay up better when you have to roll up you sleeves. Overall I'm happy I got it and can't wait for more colorways to come out.
Really pleased with this piece and happy I pulled the trigger. I sized up based on some of the reviews and am glad I did. Typically a Patagonia L, but there's a little more room with the XL and I can comfortably wear with a long sleeve base. Super comfy around the house and will be a nice layer outside when needed. Material is soft, warm and b... Read Morereathable.
Buttery soft, warm and comfortable. I wear it in a variety of settings; from around the house as a cozy sweater to a midlayer during cold winter activities. You won't want to take it off. I am 5 11", 185 lbs and have a muscular athletic build and like things on the form fitting side so I found the large too boxy around the middle and went... Read More with the medium. Wonderful fleece, highly recommended.
R1s I have always found to fight small than all other Patagonia clothes. Went up to a large and was happy. But, I wear a medium in everything else Patagonia
Fits perfect unless you like things on the more loose and relaxed side of things. I am 6'0" and 190 lbs, with an athletic build and longer than average arms. This fits pretty much perfectly on me. Could use another inch on the sleeves, but my arms are long. I may have to get another one because I always wear it as soon as it comes out of ... Read Morethe laundry. I go running in the am when it's 30 degrees out wearing only an air knit capilene base layer and this R1, and I am warm but able to vent thoroughly the whole time.
I have used the R1 air fleece crew as a base layer and as a stand alone layer depending on outside temperature. Very warm and comfortable. Stylish enough to where out casually. Great product.
Great garment, I have the R2 zip up jackets in multiple colors. I love everything about the R1 Air Fleece Crew, but it's a bit short (overall length) in comparison to the Patagonia "slim fit" fit. The neck diameter could 1/8 to 1/4 smaller. We need more color ways, overall AWESOME job ! Thank you, Teva.
Im not sure how they did it but this R1 is so light, so warm, and has a cool casual look. I wear it for snowboarding either as a mid layer or even just a base. It breathes so well. Ive never felt too hot. Definitely found a new favorite piece.
Favorite fleece to date. Works for a wide range of temperatures thanks to its insane breathability. Works on its own for active use and is a great midlayer in colder conditions
100% best shirt I have ever owned. Material is supper soft and very comfortable on the skin. The fit is perfect, I typically wear a large but bought an xl based on size chart and that I have a heavy weight capilene that also an XL. The fit of this R1 Air is just right. Not loose and not too tight. I handles movement well, doesnt pull. Again it is t... Read Morehe most comfortable shirt I have ever worn.
6-0, 215 - usually like XL in anything "slim fit" and L generally works in "regular fit" patagonia apparel. The XL is slightly baggy and works perfect as an around the house/stay warm layer.
When outside and still, it has the warmth of an R1, but when moving, air flow is great and regulates heat well.
I'm totally sold on... Read More the "air" products for any type of aerobic/high exertion - they do better than any other product at providing warmth and dealing with any sweat. Nano-air hoody, thermal airshed, pro pullover all great and have a better fabric for cutting the wind; this provides slightly more warmth but you feel the breeze (burrrr when hiking up a mountain at 20 degrees).
Wore it while WFH for about a week straight after its arrival.
I know this is a technical piece but it is so warm, cozy, and soft that I've ended up wearing it at home almost every day since I got it. Significantly warmer than the regular R1 (I have a pullover R1), but I find it just as breathable, if not more so as well as I found out when I was out shoveling snow in just the R1 Air...venting was excelle... Read Morent but kept me warm when I stopped shoveling. Liked it so much I'm trying to buy another Crew but it's sold out, so I got a 1/2 zip instead.
Really happy with this R1 Air. Feels a bit warmer than the regular R1 and in my opinion looks less technical / more casual than the regular R1 making it great for trail to town activities. Also lets be honest, were all spending a lot of time at home these days and this is a perfect work from home sweater.
Purchased a L (6ft, 165lbs, 32in waist) fits perfect on me. A medium would of been pretty tight and restrictive I feel.
In comparison to the original R1 style it feels bagger and more airy. Has a more softer feel on the inside and outside. My original R1 hoody is going strong and is a staple for outdoor activities, this r1 air feels a little more f... Read Moreragile than the OG but excels more in breath ability. A trade-off I think that many might consider when pushing it towards its limits. But if the original R1 is any indication on how tough the R line is I think the R1 air isn't gonna break without a fight. 10/10 would recommend to all lovers of the R1 original.
I have R1 and R2 mid layers that have been my go-to favorites for many years, and this fleece truly is much warmer at a lighter weight than the previous grid fleeces.
I've been looking for a fleece crewneck for a while and was excited to try out the new R1 air fabric.
Fits great over a t-shirt and slides on and off easily (not too grabby unlike the regular R1)
It is significantly warmer than the R1 fabric, so I'm glad I got the crewneck. I think I'd overheat with the zip neck.
I was worried abo... Read Moreut pet hair, but has surprisingly not been much of an issue.
My favorite mid layer in a while. It has the warmth of a heavier merino piece, with the lightweight, quick dry times, and structure of a fleece.
Ive tried every R_____ they make and this one is my favorite. It fits true to size as a base/mid layer not jacket. For me a XL like a glove 6- 240lb. Though Im an avid outdoors men, I not only work construction for a living but have a 35 acre farm too. So I find myself working and tending to animals more then climbing these days but havin this on m... Read Morey back is unbelievable, Im in love and I enjoy the crew neck so much. If your lookin to add another piece to the arsenal pick any R1 air model and if youre new to the game, best way to wet your feet.
I have both the R1 pullover and R1 jacket and love them. Ive now had the R1 air crew for two days and love it even more.
Fit: has a similar fit to my other R1 pieces, which for me are true to size.
Warmth: Im in the Midwest and its currently 20 F. I wore this outside for two hours (no base layer underneath and no jacket over it) and felt pretty go... Read Moreod. Similar in warmth to my R1 jacket which was very surprising considering how thin and light this crew is (Large weighs 9.7 ounces on my scale). Wind goes through it but It did trap my body warmth very well.
Comfort: honesty one of the most comfortable Patagonia pieces Ive ever worn.
Extras: chest pocket is small (about the size of your palm, so no phone).
Will be a welcome part of my hiking and running repertoire and I feel I can wear it out and about as well.
So far I've worn this hiking and mountain biking. It is very warm breathes very well. Even at idle in colder weather - worn over a merino base layer - it remains cozy. A great all around top! And I love the mustardy color.
Not sure I'll use the pocket, but I like the style of it. Harkens back to old photos from Himalayan climbs with sim... Read Moreilar designs. I don't climb alpine like that, but I walk and hike often and this will be my new mid-layer staple.
I am a huge fan of the current R1 and Polartec. I was also very much looking forward to this release and curious about what could possibly improve the current iteration. Well needless to say I am blown away. I got the black and green in quarter zip and a brown in crew. They are sooooo light and sooooo warm. I have been wearing air chaser tee under ... Read Moreand its been in the mid 30's and the combo is so light and warm for hikes and fishing. The mobility is much better than the R1 (not air version). The feel is warming, almost like the fleece itself is warmed, possibly by the heat released by body heat and the air ventilation allowing it to move through the garment. I am a huge fan--this is my new favorite Patagonia item!