Warm waterproof socks with merino wool for comfort in cold conditions. The Hytherm Pro are the warmest socks in the DexShell range. These mid-calf length socks feature a merino wool terry loop liner covering the full inside of the sock offering exceptional thermal protection and a comfortable fit. DexShell use advanced technologies to produce waterproof socks, hats and gloves that are remarkably flexible, breathable and comfortable to wear. All DexShell products are engineered to be a durable as possible. We back all our products with a lifetime guarantee against manufacturing defaults.