Cold weather mid length thermal socks from SealskinzStretchdry - waterproof and breathable fabricThick weight - improved circulation in cold weather conditionsThicker merino wool - moisture control and comfortElasticated ankle and instep - tensile supportY-gore heel construction - secure and comfortable fitPadded heel, toe and footbed - absorbs shock and guards against pressure and frictionHand linked toe closure - low profile seam to prevent rubbingRecommended activity skiing / touring / trekking