Hothands Body Warmers are rectangular shaped single-use air-activated heat packs that contain and adhesive on one side so they stay in place where you stick them. They provide up to 12 hours of continuous warmth for the body. Hothands warmers are single use air-activated heat packs that provide everyday warmth and are ideal for keeping your body warm when the temperature gets cold. They're available in several styles designed for hands, feet and body. Have you tried them all?