The Sealskinz Cold Weather Mid Length Hydrostop Socks are100% waterproof, windproof & breathable mid-length socks. Featuring Hydrostop to reduce water ingress. Perfect for use in colder weather conditions.Sealskinz Cold Weather Mid Length Hydrostop Socks Highlights-Waterproof - three layer construction for warmth, durability and waterproofingComfort - Merino wool lining for moisture control, insulation and comfortHydrostop - Reduces water ingressSupport - zonal elastication for added support, flat toe seams prevent rubbingComfort - Footbed padding reduces pressure and absorbs shockHydrostop Usage Guide - SealSkinz Hydrostop technology creates a seal between the sock cuff and skin, helping to reduce the amount of water from running down the leg and into the sock ... More info