[SGS Certified] RANDY SUN Unisex Waterproof & Breathable Hiking/Trekking/Ski Socks Some items in this listing are 1-PAIR and some items are 2-PAIR, pls see the color name for the detail information. 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 FOUR SIZES: Extra Small Size - fit for US men 4.5-6.5 and US women 5.5-7.5; Small Size - fit for US men 7-9 and US women 8-10.5; Medium Size - fit for US men 9.5-12 and US women 11-13; Large Size - fit for US men 12.5-14.5 and US women 13.5-15.5. Please refer to images on the left for more detailed size information. 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 Ultra-light cushion sole provides comfort and great fit,suitable for biking,walking and running during warmer seasons when there is a need to keep dry feet 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 Outer layer: 74% high waterproof nylon, 23% lycra, 3% elastane Preventing the external water molecules from entering socks Helpfully walking through creeks, rivers, mud, lakes, beaches and so on Inter layer: high performance lightweight fabric with breathable and waterproof membrane, perspiring rapidly in the movement process It will keep your feet cool and dry all day long, protect against beriberi and fit for all seasons