AQUASEALZ(TM) Waterproof Warm Weather Mid Length Sock with Hydrostop(TM) Our lightest, thinnest, waterproof sock. A mid-length, breathable sock, with Hydrostop(TM). 100% waterproof, our lighter socks are perfect for running, hiking or any activity. The Aquasealz(TM) membrane releases body-generated heat and moisture while denying the entry of water. Natural bamboo lining has strong moisture-wicking properties. Hydrostop(TM) prevents water entering the top of sock. Outer - Extra-durable nylon exterior, with 4-way stretch for an optimal fit. Mid-Section - Aquasealz(TM) membrane is 100% waterproof. Also highly effective in the release of moisture vapor from inside the sock. Interior - Bamboo lining for added moisture control. A seamless construction, with elastic support on the ankle, providing a close fit. Sealskinz accessories are made for trailblazers, united by a shared passion for adventure. Our products are designed for use in the toughest of conditions, defying the elements time and time again. The Scoulton is no different: A bamboo rayon lining has strong moisture-wicking characteristics, drawing moisture away from the skin. A waterproof Aquasealz(TM) membrane is similarly effective in the withdrawal of moisture away the body, ensuring excellent breathability. Hydrostop(TM) prevents water running down the leg and into the sock in wet, humid conditions. Made for warm weather - a Sealskinz essential. - Outer Layer - 94% Nylon, Elastane 6% - Middle Layer - Aquasealz(R) waterproof membrane - Inner Layer - 75% Bamboo Rayon, 23% Nylon, 2% Elastane