【Rapid Heating and Last 10+ Hours】 Our heated insoles are made of latest carbon fiber heating material and can warm up in a few seconds. Equipped with a rechargeable 3500mAh large capacity battery, rechargeable heated insoles keeps constant warm temperature for up to 16 hours! The batteries are low-temperature resistant and are perfect to keep your feet warm in winter for optimum blood circulation in feet.【3 Temperatures Setting and Heats Up to 140°F】The wireless heated insoles has 3 temperatures settings, operated by remote control, which can allow you freely adjust the heating temperature between 104°F - 140°F. High heat mode approx 8h, med heat mode approx 12h, low heat mode approx 16h. (Depending on environmental conditions) . Suitable for outdoor and indoor activities.【Premium Material】Foot Warmer is made of high-performance EVA material with stronger elasticity. The velvet upper layer provides your foot maximum comfort and keeps the heat going for a long time. The battery and circuit are protected by the built-in steel shell, a single insole can bear at least 661lb, valuable for outdoor activities.【WIDE APPLICATION】 The electric heating insoles will carry you through any winter outdoor activity with ease. Against the cold in the household, outdoor cycling or work. Great for hunting, skiing, fishing, hiking, snowboarding, motorcycle, riding and outdoor work, and more. Also a perfect warm gift for your parents and friends on Thanksgiving, Christmas, New Year.【Trim To Fit Size】 The unisex design is ideal for both men and women from 41 to 46 sizes. The heating shoe insoles can be trimmed to fit almost shoe size and fit easily into shoes or boot. Trim the soles for the perfect fit following size guide. We provide 1 year worry-free warranty！If any problem with the heated shoe inserts, contact us for a replacement or refund. Try our insoles and experience a fantastic winter!