The ActionHeat battery heated insoles are the perfect option for anyone with cold feet! Whether you are hiking your favorite trail in the Poconos or deer hunting in Iowa you will love the warmth and comfort of the ActionHeat insoles. With built-in ultra-fine heating panels strategically placed under the toes they are the best heated insole option on the market. The easy-to-use controller has 3 heat settings and the insoles can last up to 8+ hours while reaching up to 140F with a push of a button. The ActionHeat Insoles include (2) ActionHeat Rechargeable 3.7V Insoles W/ Heated Toes and (1) Dual micro-USB charging kit with wall adaptor. The estimated heating times are: High (III): 140F - 3+ Hours Medium (II): 120F - 4.5+ Hours Low (I): 100F - 8+ Hours.