Keep your feet functional with the Fieldsheer® Heated Insoles. These Heated Insoles are a savior for those who suffer from cold extremities. Featuring Odorsheer™ odors resist, as well benefits from a moisture-wicking high-stretch fabric to pull sweat away from the skin. These Heated Insoles use ultra slim Lithium-Ion batteries that power ultra-fine heating elements designed to provide instant heat on demand. The integrated battery compartment keeps a slim profile to remain comfortable under your outerwear. Need a change of heat? No problem, use the included wireless controller to select up to 3 heat settings and enjoy up to 7+ hours of warmth per charge. Stay warm and comfortable in any kind of weather.The Standard Heated Insoles are powered by our 3.7-volt Rechargeable Lithium-Ion Battery (3.7V 2200mAh) – Reliable power in a compact package. The included AC wall charger (3.7V) charges both of your soles fast so you are ready to go quickly. The 3.7V DC output port is compatible with all of our Standard Heated Socks. Insole Features:Soft and Ultra Thin Sole that Fits Most ShoesSweatsheer™ Moisture WickingOdorsheer™Anti-OdorHidden WiresIntegrated Battery CompartmentHeat Zone Under the Toes3 Selectable Heat SettingsWireless Controller Adjusts Heat LevelsAvailable in M4-10/W6-11 & M10-14