Outer Layer- 61% high waterproof nylon,32% polyester,7% elastane; Interlayer- 100% high performance lightweight 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. Waterproof & Breathable- High quality nylon endow our 100% waterproof breathable socks high duration. 100% Waterproof and breathable membrane effectively prevent moisture penetrating into our lining area, keeping our feet dry and comfortable. Coolmax has a good moisture conductivity, rapidly wicking perspiration away from our skins and offering a soft feeling to our feet. Outdoor Waterproof Socks- Our blisters and water resistant socks are suitable for outdoor activities. Smooth seamless toe avoids yarn chaffing and irritation, reducing abrasion and eliminating blisters on the toes. Cushioned heel and toe guard against pressure and friction, keeping our feet more comfortable. Best athletic waterproof socks for women and men who like hiking, skiing, skating, trekking, cycling, kayaking, fishing, hunting, rocky climbing, camping and so on. Winter Warm Waterproof Socks- 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. Decent thickness provides our waterproof windproof socks with ideal warmth retention, keeping our feet warm in cold weather and damp environments. These winter waterproof thermal socks can be used in both our daily life and on business trips. Washing Instruction- Machine wash below 40?/ 104?, hand wash under normal temperature. Do not iron or dry clean. Tumble dry within 60?/ 140?. Each pair of our lightweight 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.