SEALSKINZ Briston Unisex Waterproof Warm Weather Mid Length Merino Wool Lined Sock Seamless, Thin & Comfortable Hydrostop to Block Water Penetration

100 Percent WATERPROOF | BREATHABLE | WINDPROOF 100 Percent Waterproof - three layer construction for warmth, durability and waterproofing Hydrostop - a silicone-like (although it is silicone-free) elastic taping around the inside cuff of the sock. This added protection reduces the chances of water dripping down your leg into your sock Comfort - merino wool lining for moisture control, insulation and comfort. Zonal elastication for added support and blister prevention Please note that due to the close bond between sock cuff and skin, over prolonged use, some people may experience minor skin irritation due to the Hydrostop barrier rubbing against the skin. For those who experience any irritation, we recommend that Hydrostop socks are only used outdoors and not for a prolonged period of time.