About our waterproof socks: RANDY SUN’s Unisex Waterproof Socks is a new patented product that has been certified by SGS corporation. Due to its favorable durability and high air permeability , our waterproof socks has become one of the choices for outdoor enthusiasts, military personnel as well as postal clerks . Features: 1) The three-layer knitting construction design handily solves the contradiction between waterproofing and breathing property. 2)It will keep your feet cool and dry all day long and fit for all seasons. 3)Soft Cushion & Seamless Toe: The reinforced heel and seamless toe ensure the long-lasting comfort and avoid yarn chaffing and irritation. 4) 100% waterproof and breathable, warm and comfortable, 100% seamless, perfect fit on the feet. Weight: Each pair of the Mid-Calf socks(Size M) weighs 3.42 ounces; Each pair of the Ankle socks(Size M) weighs 2.47 ounces. Package: One pair of socks per package. Wish you a good time shopping here!