Great to wear hunting, skiing, snowboarding, walking and more, the Heat Factory Pocket Socks in a Merino wool propylene blend provides warmth and protection for your feet in cold weather conditions. Special pockets accommodating Heat Factory warmers are sewn over the toes to keep focus areas warm. The cushioned arch and reinforced heel give the sock added durability and comfort. Two Heat Factory Foot Warmers are included with the pair of socks, each providing up to six hours of warmth (additional warmers are sold separately). The above-calf length protects your legs when out in the woods hunting or hiking among brush. Heat Factory's air activated hand warmers, body warmers, toe warmers, and heated accessories have been providing warmth and pain relief to outdoor enthusiasts for the past 30 years.