This 100% waterproof, windproof & breathable ankle-length sock is perfect for use in a wide variety of weather conditions. Featuring Sealskinz Aquasealz waterproof technology that combines a 100% waterproof hydrophilic membrane between a premium Merino wool interior for warmth and sweat-wicking, and a durable Polycolon exterior with 4-way stretch for great fit and wearability. Footbed padding reduces pressure and absorbs shock while zonal elastication provides added support. Designed with a seamless construction including hand-linked flat toe seams and the addition of elastic support on the ankle, heel and instep, you won’t notice the seams but will definitely notice the extra comfort and fit. 100% waterproof, 100% comfortable. Machine washable. 62% Other fibres, 29% Nylon, 9% Elastane.