Hothands Insole Foot Warmer -The insole foot warmers are ultra- thin and measure the full length of an insole to keep your entire foot warm. HotHands® Insole Foot Warmers are single use air activated heat packs that provide everyday warmth and are ideal for keeping your feet warm when the temperature gets cold. These warmers provide safe, natural heat, so you can enjoy the great outdoors during those harsh winter months. Each pair provides up to 9 hours of heat with adhesive on one side so it stays where you stick itReady to use, Air activatedSafe, Natural heatQuick, long-lasting heat