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's comfortable next to skin, making it a favorite base-layer and sock fiber, though it's pricier and dries slower than synthetics.
Pertex Shield is Pertex's family of lightweight waterproof, windproof, and breathable laminates used in rain shells and insulated jackets, with versions like Shield Air tuned for high breathability and low weight. Known for packability and soft hand-feel, Pertex Shield is a common alternative to Gore-Tex in lightweight and fast-moving outdoor apparel.
The GORE-TEX ePE membrane is Gore's waterproof-breathable membrane made from expanded polyethylene (ePE) instead of ePTFE, developed to be free of PFAS 'forever chemicals' of concern. It's also thinner and lighter while keeping durable waterproof, windproof, and breathable performance, marking Gore's shift toward more environmentally responsible materials.
GORE-TEX Active is the most breathable and lightweight tier of Gore-Tex, optimized for high-output aerobic activities like trail running, fast hiking, and cycling in the rain. It uses minimal, lightweight constructions to maximize moisture-vapor transfer and comfort during hard effort, prioritizing breathability and low weight over the rugged durability of GORE-TEX Pro.
GORE-TEX Paclite is a lightweight, packable tier of Gore-Tex that replaces the inner fabric layer with a protective coating (a 2.5-layer-style build), minimizing weight and packed size. It's designed for stowable, take-along rain protection for hikers and travelers who want reliable waterproofing without carrying a heavy shell, trading some durability and next-to-skin comfort for portability.
GORE-TEX Pro is the most durable and highly breathable tier of Gore-Tex, engineered for extended, rugged use in demanding conditions like alpine climbing, ski patrol, and expeditions. It uses an always-3-layer construction with rugged face fabrics and a high-performance membrane, prioritizing long-term ruggedness and breathability over the lower weight or price of other Gore-Tex lines.
H2No Performance Standard is Patagonia's proprietary waterproof, windproof, and breathable technology and rigorous testing protocol used across its rain shells. Rather than a single membrane, it's a standard a garment must pass — including a 'Killer Wash' durability test that repeatedly launders and weathers garments to ensure they keep performing over real-world use.
Reproofing is restoring the Durable Water Repellent (DWR) finish on a waterproof-breathable garment so water beads and rolls off again instead of soaking in. Because DWR wears off with use and washing, periodic reproofing — cleaning, reactivating with heat, and applying a new wash-in or spray-on treatment — keeps a shell breathing properly and looking dry.
2.5-layer (2.5L) construction laminates a face fabric to a membrane, then adds a thin printed or sprayed protective coating — the 'half layer' — instead of a full inner fabric. This makes very light, packable rain shells at lower cost, but they're less durable and can feel clammier against the skin than 3-layer shells. It's common in emergency and ultralight rain jackets.
3-layer (3L) construction bonds an outer face fabric, a waterproof-breathable membrane, and an inner protective backer fabric into a single laminate. This makes the most durable, weatherproof, and comfortable waterproof shells, protecting the membrane on both sides, at the cost of more weight and price than 2.5-layer or 2-layer builds. It's the standard for hardshells.