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- X-Small Size- fits for US Shoe Size men 5-6.5 and women 5.5-7.5;Small Size- fits for US Shoe Size men 7-9 and women 8-10.5; Medium Size- fits for US Shoe Size men 9.5-12 and women 11-13; Large Size- fits for US Shoe Size men 12.5-14.5 and women 13.5-15.5. The cuff of socks is not waterproof, please don't let water over the top of socks. Waterproof socks can keep feet dry and warm at work or outside sports. Waterproof & Breathable- Our waterproof crew socks feature 100% waterproof and breathable membrane, which can effectively let water not penetrat into lining area and keep you feet dry and warm. Moisture-wicking coolmax inner keeps your feet away from sweated. High quality nylon make our 100% waterproof socks more durable and sturdier. Just buy it now and have a try! You will love our SuMade waterproof socks! Comfortable Fit- Our mid-calf waterproof socks are cushioned at heels and toes, offering amazing shock absorption and guard against pressure and friction. Elastic cuff efficiently lets socks not slid into your boots or shoes. The Y-heel can completely cover the heel, providing extra secure and comfort for your feet. Smooth seamless toe avoids yarn chaffing and irritation, reducing abrasion and eliminating blisters. Lightweight materials would never make your feet feel dull. Your Outdoor Sports Partner - Delicate three-layer designs provide our water resistant socks with decent Water resistance and air permeability. They are popular with those who like hiking, trekking, cycling, kayaking, fishing, hunting, rocky climbing, camping, skiing, skating, wading and so on. Our outdoor waterproof socks are also suitable for daily life or on business trips to keep our feet dry warm and comfy in cold weather, damp environments. Washing Instruction- When these waterproof 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℉.