LONG-LAST HEATING - Ultra thin and full length of insole for entire foot warm. Each warmer stays working UP TO 8 hours. Odorless, single-use item. If heat decreases, expose warmer to air to activate them again. NATURAL HEAT AND ESY TO USE - Eco-friendly iron ingredients with soft non-woven fabric, air activated, no leaking. Remove warmer from outer package, warmer heats up in few minutes. No electricity, boiling or additional warming necessary for the heat pads. MULTIPURPOSE WARMERS - The combination of the ingredients has been specially formulated to ensure a constant and comforting heat for a wide variety of uses. Theyre available in several styles designed for your hands, feet and body. Convenient, compact, portable. MUST HAVE IN COLD WINTER - Single use air-activated heat packs that provide everyday warmth and are ideal for outdoor sporting events, hunting & fishing, camping & hiking, working in the yard or taking your pet for a walk. Cosy warmth anytime, anywhere.