Fieldsheer Men's Standard Heated Insoles - Keep your toes toasty and your feet functional the Fieldsheer Heated Insoles are a savior for those who suffer from cold extremities. These heated insoles use ultra slim Lithium-Ion batteries that power ultra-fine heating elements designed to provide instant heat on demand. Standard Heated Insoles are powered by 3.7-volt Rechargeable Lithium-Ion Battery (3.7V 2200mAh) included Soft and Ultra Thin Sole that Fits Most Shoes Sweatsheer Moisture Wicking Odorsheer Anti-Microbial Hidden Wires Integrated Battery Compartment Heat Zone Under the Toes 3 Selectable Heat Settings Wireless Controller Adjusts Heat Levels Up to 11 Hours of Power Per Charge UL/CE certified AC wall charger included Charge Time 3-4 hours, charge time is based off using included AC wall charger Style: MWUS08010