WATERPROOF & BREATHABLE: Socks Passed SGS CERTIFIED.100% waterproof. Make of three-layer construction. Outer is 61% high waterproof nylon. Inter layer is a high performance waterproof and breathable membrane. Keep your feet dry and and not letting the water absorb. PROTECT YOUR FEET: PRESELF socks are anti-slip. The knitted, seamless design prevents your feet from getting blisters, aching, and pressures. Breathable membrane optimizes the ventilation. FOR OUTDOOR SPORTS: Whether daily wear or outdoor sports, this socks can wear in various kind of harsh environments. cold, hot, or warm weather. Specially the ground was covered with water or snow. It suitable for biking, walking, running, hiking, trekking, skiing, traveling, backpacking, camping, hunting. MACHINE WASH SAFE: Our waterproof socks can machine washable below 100?F / 40?C. Don’t iron, dry clean or tumble dry. We recommend hand wash and spin dry Hang in ventilated place to drip dry . Hand wash will extend socks life tenfold. NOTICE: Don’t wear socks only. Please put on shoes when walk. Avoid sharps punctured the membrane in inter layer.Keep water line below the cuff. Otherwise water leak from the cuff.