Battery heated socks for winter activities effective for up to 5 hours and ideal for walking hiking skiing hunting and winter sports the heat is concentrated to the toe area of the sock producing a mild warmth preventing toes from becoming cold powered by 3 lr6aa batteries not supplied made of 30 wool70 acrylic hand washable to use insert the batteries into the slim battery pack and switch to on the battery pack fits in the battery pouch which can be button closed