Warm hands and feet on the coldest days the very latest in thermal technology these lightweight glove and sock liners use metallic threads woven into stretch nylon to trap body heat reflecting it back into your hands and feet to provide incredible warmth worn under your usual socks and gloves they provide fantastic insulation in extreme cold and have stretch cuffs to seal the maximum amount of warmth in but are extra thin so your hands and toes can move freely comfortable and durable they