Terramar Battery Heated Socks:
Small = Men's 3-5.5, Ladies 4-6.5,
Medium = Men's 6-8.5, Ladies 7-9.5,
Large = Men's 9-12, Ladies 10-13
X-Large = Men's 12.5-15
Terramar Heating Elements: The heating element of Battery Heat Socks is located within an enclosed area in the bottom of the toe area in the sock. The heating element is padded and protected and will keep your toes and feet warm, without any discomfort. The wires inside the soft black fabric channel run down the length of the inside of the sock. The wires do not produce any heat. Heat Sox are very safe to use and produce a low amperage which eliminates all possibility of shock or burn, even when wet. These socks get warm, but not hot. They perform best when wearing shoes or boots that trap heat that radiates around entire foot.
Battery Life: For best performance, use high quality "9V" alkaline batteries. You'll receive about 4-5 hours of heat. If you use rechargeable batteries, you'll receive about 2-3 hours of heat. Care: Hand wash in warm water with mild detergent. Use a gentle squeezing action to wash and rinse. Hang dry, towel dry or lay flat to dry.