Unlike microwavable models that lose their warmth in less than an hour, these rechargeable heated slippers ward off chilly feet for up to six hours. Exclusive to Hammacher Schlemmer, the slippers are powered by an unobtrusive rechargeable battery pack that tucks discreetly into a hook-and-loop pocket. The stainless steel fiber heating element under the forefoot--similar to that used in heated car seats--maintains a consistent temperature to keep feet comfortably warm and extend battery life. The slippers have 100% nylon taffeta uppers with a ribbed rubber outsole for traction indoors or outdoors and an elastic cuff that seals out the cold. A dual AC adapter recharges both batteries in five hours. Machine wash. Light Beige. Sizes S (Women's 5/6), M (7/8), L (9/10) or XL (11/12). If in between sizes order the next size down. (3 lbs.)