"With their thin, stretchy fabric and extended gauntlets, ActionHeat 5V Battery Heated Glove Liners for Men are designed to be worn under other gloves for added warmth. Powered by rechargeable batteries (included), the built-in heating elements are perfectly positioned along the fingers and thumbs so the heat circulates to keep your hands warm. ActionHeat glove liners have touch-button technology with 3 easy-to-use settings, providing heat up to 150F that lasts up to 5+ hours. They're made from flexible 95% polyester/5% spandex for lightweight warmth, comfort, and versatility. ActionHeat 5V Battery Heated Glove Liners are guaranteed to keep your hands warmer, no matter what the weather conditions, and come with two 5V 3000mAh batteries and a 24"" dual battery charger kit. They're easy to use, toojust charge up the batteries, insert them into the gloves, and choose 1 of 3 heat levels. Estimated Heating: High (Red): 150F for 2+ hours; Medium (Blue): 130F for 3+ hours; Low (Green): 110F for 5+ hours. Charging time: 46 hours. Machine wash (without batteries). Imported.Manufacturer style #: AH-GL-5V-1. Moisture-wicking, flexible 95% polyester/5% spandex Liners fit comfortably under most gloves or mittens for optimal heat transfer Strategically placed heating elements along fingers and thumbs powered by 5V batteries Onboard temperature control button allows easy access to the 3 heat settings Waterproof zip battery pockets store rechargeable lithium-polymer batteries Easy to usejust charge up the batteries, insert them into the gloves, and choose 1 of 3 heat levels"