When your activities put you in the cold outdoors, walk with warmth and comfort in your shoes by using this foot warmer. It is designed to deliver a 105degF average activate temperature that ensures your feet stay warm. In addition, it is capable of lasting for up to 5 hours. Odorless, environmentally friendly and air activated, the Yaktrax(R) Foot Warmer comes in a pack of 2 warmers. FEATURES: Air activated 105degF average activated temperature Up to 5 hours of heat Odorless Environmentally friendly Safe to use 2 warmers per pack Yaktrax