H2No® Performance Standard is Patagonia’s benchmark for waterproofness, breathability and durability, which ensures a high level of long-term performance backed by our Ironclad Guarantee. H2No Performance Standard products undergo the most rigorous testing in the industry. Killer Wash is Patagonia’s proprietary wet flex test that simulates years of use in drenching conditions. The H2No Performance Standard for waterproof shell garments is 20,000 MM before, and 10,000 MM after our Killer Wash test (per JIS L 1092 B). We also send our ambassadors and testers into the field to punish these garments in every possible condition to expose any potential weakness in materials or construction. We reject any garment that does not pass our tests, regardless of technology or fabric supplier. Whether it’s a bomber 3-layer alpine shell or a pared-down rainwear piece, the same rules apply.

2.5-layer H2No® Performance Standard shell fabrics are waterproof, windproof, breathable and highly packable. They combine a water-repellent shell fabric with a waterproof barrier and a raised pattern on the inside, instead of the interior scrim used in 3-layer fabrics. The raised pattern makes 2.5-layer fabric light and compressible, while still protecting the waterproof barrier.