The Bridgedale StormSock HeavyWeight Boot Sock is 100% Waterproof. This unisex sock with a heavyweight terry footbed and ankle is ideal for outdoor activities where an equal balance of warmth and breathability is desired.Comprising 3 layers the Heavyweight boot length StormSock features dense resilient terry cushioning throughout the sock for warmth and padding. Primarily knit from Merino Wool, known for its anti-bacterial, anti-odour and moisture management properties, the sock will keep your feet warm, dry and comfortable. The outer layer sock, made from nylon, protects the Hydrotech waterproof breathable membrane against abrasion from the boot. Lycra knit through every course gives the sock Bridgedale's performance fit and together with the flat toe seam and elastic arch support ensure the sock remains in place and doesn't cause any hotspots ... More info