Sealskinz took their original waterproof sock and beefed it up to take on both the cold and rain. Wet feet can lead to all sorts of not-so-good things outdoors, including numbness, blisters, and frostbite. These Waterproof Cold Weather Mids will keep you dry and warm in leaky waders, through stream crossings, and in rain, snow, and mud. These cold weather socks are crafted using a three-layer bonded construction that combines a 100% waterproof hydrophilic membrane with a premium Merino wool interior for warmth and sweat-wicking, and a durable nylon blend exterior with 4-way stretch for great fit and wearability. Designed with warmth in mind these socks are constructed with the finest Merino wool and an added a layer of terry-loop knitting. This loop knitting actually traps heat within the air pockets keeping you warmer when you're in the coldest conditions. The perfect mix of waterproofness and breathability, waterproof socks are ideal for keeping your feet dry and warm while cycling, hunting, commuting, working outside, fishing, or hiking. Designed with a seamless construction including hand-linked flat toe seams and the addition of elastic support on the ankle, heel and instep, you won’t notice the seams but will definitely notice the extra comfort and fit. Exclusively handmade in the UK to an unrelenting standard and attention to detail, every single sock is hand-tested for waterproofness.