The SealSkinz Stanfield Waterproof Extreme Cold Weather Mid Length Sock is a 100% waterproof, windproof & breathable mid length sock. The inner lining is crafted from fine Merino Wool to insulate and regulate temperature making this perfect for use in very cold conditions. SealSkinz Stanfield Waterproof Extreme Cold Weather Mid Length Sock HighlightsWIDE RANGE OF ACTIVITIES Waterproof and warm, they're an ideal choice when you're at risk of getting wet in snow, ice, mud or rain while out hiking, fishing, cycling, or running in extreme conditions.BUILT FOR EXTREME TEMPS Crafted with the thickest insulation, this sock is ideal for extremely cold and wet conditions where thermal retention is imperative ... More info