Heatmax Toastie Toes are rectangular shaped single use air-activated heat packs that provide continuous 8 hour warmth for the toes and are ideal for keeping your feet and body warm when the temperature gets cold. They are ultra thin, ready to use, air activated, and provide safe, natural heat that is perfect for skiing, snowboarding, hiking, working in the yard, or just shopping on cold days.Toe Warmers work by using ingredients like iron, activated carbon and water. Once these ingredients come into contact with the oxygen in the air, the ingredients oxidize and produce heat. The combination of ingredients has been specially formulated to ensure a constant and comforting heat for a wide variety of uses. This value pack contains six pairs of adhesive toe warmers.