Amazon.comPerfect for skates, ski boots, or shoes, the Heatmax Toasti Toes Foot Warmers are air-activated toe warmers with full adhesive on one side that sticks to your socks and helps them to stay firmly in place. Toasti Toes provide up to 6-8 hours of 100-degree-Fahrenheit warmth and are designed for the active sportsman who will be walking or moving continuously while outdoors in the cold. All Heatmax warmers are made of natural materials, including iron powder, water, salt, activated charcoal, and wood fiber. When exposed to air, these materials react together to produce heat through an extremely fast oxidation (or rusting) process. Users should allow 10 to 20 minutes for the warmers to reach their optimal temperatures.Product DescriptionHotHands 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 your hands, feet, and body. Perfect for skates, ski boots, or shoes, the Heatmax Toasti Toes Foot Warmers are air-activated toe warmers with full adhesive on one side that sticks to your socks and helps them to stay firmly in place. Toasti Toes provide up to 6-8 hours of 100-degree-Fahrenheit warmth and are designed for the active sportsman who will be walking or moving continuously while outdoors in the cold. All Heatmax warmers are made of natural materials, including iron powder, water, salt, activated charcoal, and wood fiber. When exposed to air, these materials react together to produce heat through an extremely fast oxidation (or rusting) process. Users should allow 10 to 20 minutes for the warmers to reach their optimal temperatures.