Outer: 61% high waterproof nylon, 32% polyester, 7% elastane;Interlayer: a high performance lightweight function of waterproof and breathable membrane, Lining: 66% coolmax, 30% polyester,4% elastane FOUR SIZES: Extra Small Size – fit for US men 5-7 and US women 6-8; Small Size – fit for US men 7.5-9.5 and US women 8.5-11; Medium Size – fit for US men 10-12.5 and US women 11.5-13.5; Large Size – fit for US men 13-15 and US women 14-16. Please refer to images on the left for more detailed size information. Premium Waterproof Breathable Socks designed with a three-layer construction, which handily solves the contradiction between waterproofing and breathing property. Outer layer: 61% high waterproof nylon, 32% polyester, 7% elastane; Inter layer: a high performance lightweight function of waterproof and breathable membrane; Lining: 66% coolmax, 30% polyester,4% elastane. SUITABLE OCCASIONS: 1)Ultra-light cushion sole provides great comfort and fit, keeping your feet cool and dry during walking, running, cycling or gardening in warm seasons. 2)Perfect windproof and water resistant socks for outdoor activities in harsh environment with mud and water all over the place: trekking, hiking, mountain biking, fishing, hunting and exploring. 3)Also Fit for many snow and water sports: skating, skiing, ice rock climbing, snow fights, ice golf, ice archery and surfing. PERFORMANCE: 1)Superior wear-resisting waterproof socks with high elasticity and decent thickness. 2)Ensure the high performance of thermal comfort. 3)Keep your feet cool and dry all day long. 4)Soft Cushioning: Reinforced heel and toe assures your feet long-lasting comfort. 5)Great gift to your family and friends on Thanksgiving Day, Halloween, Christmas Day, New Year or their birthday. WASH & CARE: Hand wash under normal temperature; if washed by machine, the water temperature should be below 40 centigrade. Do not iron, dry clean or tumble dry. Hang in ventilated place to air dry after spin-drying. No distortion or color fading after multiple washings.