Outer: 61% waterproof nylon,32% polyester,7% elastane; Inter: 100% waterproof and breathable membrane; Lining: 66% coolmax,30% polyester,4% elastane. Imported Size Chart- Small size fits for US men 7-9 and US women 8-10.5; Medium size fits for US men 9.5-12 and US women 11-13; Large size fits for US men 12.5-14.5 and US women 13.5-15.5. Each pair of our waterproof socks is packed in individual delicate draw string bag, ideal holiday and birthday gifts for men/ women, husband/ wife, boyfriend/ girlfriend and beloved ones. Waterproof & Breathable- High quality nylon make our 100% waterproof socks more durable and sturdier. 100% Waterproof and breathable membrane effectively prevent moisture penetrating into our lining area and creating a perfect breathability for our socks. Coolmax has a good moisture conductivity, rapidly wicking perspiration away from our skins and offering a warm and soft feeling to our feet. Exceptionally Comfortable Fit- Padded heel, toe and footbed offer amazing shock absorption and guard against pressure and friction. Elastic cuff would never strangle your feet and efficiently prevents your socks sliding into your boots and shoes. The Y-heel can completely cover the heel, providing extra secure and comfort for our feet. Smooth seamless toe avoids yarn chaffing and irritation, reducing abrasion and eliminating blisters on the toes. Occasions- Our complicated waterproof socks are indispensable equipment for sports enthusiasts with multiple functions: seamless, waterproof, windproof design, high breathability, fine feet fit, superb warmth. These socks are wildly used in hiking, skiing, skating, trekking, climbing, cycling, fishing, hunting, wading and other outdoor activities. Absolutely, you can dress them in daily life or on business trips, which can keep your feet warm and comfy in cold and damp environments. Washing Instruction- When these socks are machine washed, the water temperature should be below 40?/ 104? and while hand washed, the water should under normal temperature. Do not iron or dry clean. Tumble dry is feasible within 60?/ 140?.