LONG-LAST HEATING - Each pair of foot warmers is individually packaged, provides up to 8 hours of heat. Ultra thin and full length of insole for entire foot warmth. DISPOSABLE & SAFE - Non Toxic and Odorless. These single use foot warmers are made from ingredients that won’t harm the environment. They use natural heat to keep your feet heat. EASY TO USE - Take foot warmers from outer pack, shake to activate. Foot warmer heats up in 5-15 minutes. If heat decreases, expose warmer to air and shake. After use, dispose with regular garbage. MULTIPURPOSE WARMERS - Provide everyday warmth and are ideal for various outdoor sporting activities, such as hunting, fishing, camping, hiking, skiing and more! Convenient and portable. NATURAL WARM - Eco-friendly iron ingredients with soft non-woven fabric, air easy to penetrate, heat evenly and no leaking. To ensure you use the warmer safely, do not apply directly to the skin.