Whether you head out to grab the mail or lounge out on the couch, the ActionHeat Adults' 5 Volt Battery-Heated Slippers will make sure your feet stay toasty warm for hours. The integrated heating design at the bottom of the slippers is encapsulated by a thermal seal to add durability and moisture protection, and the EVA outsoles remain strong if you have to head outdoors. The rayon/acrylic/cotton/spandex uppers feel soft and warm on your feet, and the strategically-placed heating elements with ultra-fine fibers help boost the heating panels' power by helping the heat stay trapped inside the slippers.