Hiking Biking 100% Waterproof mid-calf socks will keep your feet warm and dry all day long. These socks have a special 3-layer construction to keep the water out but let your feet breathe: 1- An abrasion resistant nylon outer, 2- 100% waterproof and highly breathable middle membrane, and 3- Thermal terry loop Merino Wool inner for extra warmth in cold weather. Great for all outdoor sports such as hiking, mountain biking, hunting, etc. and a wide range of wet weather activities. A seamless design and snug, well cushioned sole prevents friction to reduce the risk of blistering. Our waterproof socks are cozy, comfortable, and suitable for daily wear. These socks are not submersible. Care Instructions: Hand wash or machine wash under 40 degrees. Do not iron. Do not dry clean. Drip dry recommended. Material: Outer layer: waterproof nylon/lycra/elastane. Middle layer: 100% waterproof & breathable membrane. Inner: 12% Merino Wool/lycra/elastane.