Fit & Design: An integrated heating system located along the fingers and thumb Highly versatile fitted construction fits comfortably under most gloves or mittens for optimal heat transfer Moisture-wicking polyester & spandex material blend provides warmth and comfort Waterproof zippered battery pocket stores rechargeable lithium-polymer battery High-quality stretchable fabric provides lightweight warmth, comfort, and versatility Technology: Onboard temperature control button allows easy access to the 3 heat settings providing adjustable warmth Strategically placed heating elements use ultra-fine fibers for optimal heating performance Onboard temperature control button allows easy access to the 3 heat settings providing adjustable warmth Additional Details: Two ActionHeat 5V Battery Heated Glove Liners w/ heated fingers Two Rechargeable 5V 3000mAh Batteries One 24" Dual battery charger kit Heating time: high (red) - 150F 2+ hours Heating time: medium (white) - 130F 3+ Hours Heating time: low (blue) - 110F 5+ hours