When it's Autumn, it's Britain, so it WILL rain. If you're going to be out in the great outdoors you may want to invest in a pair of waterproof socks. The Sealskinz Unisex Starston Sock is the original, 100% waterproof, windproof & breathable mid length sock. The inner lining is crafted from fine Merino Wool to insulate and regulate temperature making this perfect for use in colder weather conditions. Please note: this product is formerly known as the Unisex Waterproof Cold Weather Mid Length Sock. Our 100% waterproof socks are constructed using premium materials and by bonding three layers together to make one highly waterproof and breathable sock: Outer Layer - 90% Nylon, 10% Elastane Middle Layer - Aquasealz waterproof membrane Inner Layer - 35% Merino Wool, 35% Acrylic, 23% Polyester, 3.5% Nylon, 3.5% Elastane