STORMSOCK MIDWEIGHT BOOT SOCK 100% Waterproof knee length sock with a dense resilient terry cushioned footbed, heel and ankle, this sock is ideal for outdoor activities where a balance of warmth and breathability are desired Comprising 3 layers the Midweight boot length StormSock features a dense resilient terry pad footbed, heel and ankle for warmth and cushioning 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 Bridgedaleâs performance fit and together with the flat toe seam and elastic arch support ensure the sock remains in place and doesnât cause any hotspots. The stretch PU membrane and clever matrix lamination process that bonds the three layers of Bridgedaleâs Stormsock together ensure they have class leading stretch built right in, wear after wear. Covering the leg up to the mid-calf our boot length can be easily be protected from water ingress with waterproof trousers or gaiters. FEATURES: 3 LAYERS FOR WARMTH Outer : 95% Nylon, 5% Elastane; Inner : 54% Merino, 36% Polyester, 7.5% Nylon, 2.5% Elastane; Membrane : 100% PU 100% WATERPROOF The HydroTech PU membrane allows perspiration to pass to the outer layer of the sock while preventing outside water from getting inside DURABLE: An extremely durable and long lasting outer sock protects the Waterproof Membrane against abrasion from the boot MIDWEIGHT: Designed for 3 season hiking and trekking in all conditions, our Midweight Bridgedaleâs offer a balance of high wicking yarns to manage variations in temperature that cause feet to sweat and resilient cushioning throughout the foot bed and around the ankle to keep the foot comfortable in leather and synthetic footwear.