[SGS Certified] ISEYMI Unisex Waterproof & Breathable Hiking/Trekking/Ski Socks 74% nylon Pull On closure Outer: 74% high waterproof nylon, 23% lycra,3% elastane, Interlayer: a high performance lightweight function of waterproof and breathable membrane, Lining: 64% coolmax,3% lycra,33% elastane Three sizes (unisex): Small (6.5-10),Medium (9-12.5),Large (12-14.5);See the images for more size information(USA Men,USA Women) Daily Wear,foot care,especially suitable for outdoor sports and activities of various kind of harsh environments 100% waterproof and breathable,moisture and perspiration absorption,anti bacterial function to reduce bad odour Hand wash under normal temperature,water temperature should be below 40 degree centigrade if machine wash, do not iron, dry clean or tumble dry but hang to dry after spin-dry in ventilated place