Seirus Innovation 2915 Hyperlite Winter Cold Weather Super Thin Polartec Stormsocks WATERPROOF AND BREATHABLE - Our exclusive Weathershield material offers a great combination of windproof, waterproof and breathability COMFORTABLE - 4-Way Stretch keeps your feet comfortable for all day wear WARM AND DRY - Wicking fleece lining is designed to keep your feet warm and dry DURABLE - Perfect for all footwear and outlasts ordinary socks 3 to 1! VERSATILE - Perfect sock to wear under your ski/snowboard boots for all day comfort and warmth Hyperlite Stormsocks uses technology from Seirus Innovation and Polartec WeatherShield Super thin and lightweight version of Seirus exclusive WeatherShield fabric that is both waterproof and windproof Wicking fleece lining ensures not only to keep the moisture out, but to keep the warmth in The 4-way stretch outer layer can stretch to fit each individuals foot size Stormsocks outlasts any ordinary sock 3 to 1