Merino wool is a fine, soft natural wool from Merino sheep, valued in outdoor clothing for warmth even when damp, excellent breathability and temperature regulation, and strong natural odor resistance. Unlike coarse wool it is comfortable next to skin, making it a favorite base-layer and sock fiber, though it is pricier and dries slower than synthetics.
Pertex Shield is a line of waterproof-breathable fabrics from Pertex, used in rain jackets, shells, and other weather-protective outdoor garments. Combining a waterproof-breathable coating or membrane with Pertex's lightweight face fabrics, it keeps rain out while allowing some moisture vapor to escape, typically prioritizing low weight and value. It's an alternative to membranes like Gore-Tex, offering waterproof protection in lighter, often more affordable shells.
Gore-Tex ePE is a newer waterproof-breathable membrane from Gore made of expanded polyethylene (ePE) rather than the traditional expanded PTFE, developed to eliminate PFCs of environmental concern (PFAS) from the membrane while remaining thin, light, and durable. It represents Gore's shift toward more sustainable, PFC-free waterproof-breathable fabrics, delivering comparable weather protection and breathability with a reduced environmental footprint.
Gore-Tex Active is the tier of Gore-Tex engineered for maximum breathability and minimal weight, designed for highly aerobic activities like trail running, fast hiking, and cycling in wet conditions. It prioritizes dumping sweat during intense effort over the durability of heavier Gore-Tex lines, using lightweight constructions. The trade-off is reduced durability and abrasion resistance, making it best for fast, light use rather than hard, prolonged abuse.
Gore-Tex Paclite is the lightweight, highly packable tier of Gore-Tex waterproof-breathable fabric, designed for situations where minimizing weight and packed size matters more than maximum durability — such as fast-and-light hiking, trail running, and emergency rain protection. It uses a lighter 2.5-layer construction, trading the ruggedness and longevity of Gore-Tex Pro for low weight, packability, and a lower price.
Gore-Tex Pro is the most durable and rugged tier of Gore-Tex waterproof-breathable fabric, engineered for demanding, prolonged use in harsh conditions — alpine climbing, mountaineering, ski touring, and professional applications. It uses tough face fabrics and a robust multi-layer construction to maximize durability, breathability, and weather protection for hard use, at the cost of being heavier, stiffer, and pricier than lighter Gore-Tex lines.
H2No is Patagonia's proprietary waterproof-breathable technology used in many of its rain jackets and shells, as an in-house alternative to licensed membranes like Gore-Tex. Like other waterproof-breathable fabrics, H2No keeps rain out while letting sweat vapor escape, paired with a DWR finish. Patagonia tests H2No products rigorously for durability of waterproofness, and the technology lets Patagonia control performance, cost, and sustainability of its shells.
Reproofing is the process of restoring the durable water repellent (DWR) finish on a waterproof-breathable garment (or other gear) once the original treatment has worn off, so that water once again beads up and runs off the face fabric instead of soaking in ('wetting out'). Done with wash-in or spray-on DWR products and usually activated with heat, reproofing restores both water repellency and breathability, and is a key part of maintaining rain shells and prolonging their useful life.
Two-and-a-half-layer (2.5L) construction is a method of building lightweight waterproof-breathable shells in which the membrane is bonded to the outer face fabric, and instead of a full inner backing layer, a thin protective coating (often a printed pattern) is applied over the membrane's inside — the 'half layer.' This makes 2.5L garments the lightest, most packable, and often most affordable rain shells, ideal for emergency rain jackets and weight-conscious use — at the cost of durability and next-to-skin comfort.
Three-layer (3L) construction is a method of building waterproof-breathable shells in which the outer face fabric, the waterproof-breathable membrane, and a protective inner backing layer are all bonded together into a single laminate. This makes 3L garments durable, lighter and more packable than designs with a separate liner, and well-suited to hard use and abrasion — at the cost of being stiffer, less comfortable next to the skin, and more expensive than 2-layer or 2.5-layer constructions.
