Using a powerful 7 V heating system that lines all the fingers, keeps warm and comfortable for all outdoor activities. With the thin, stretchy design, and extended gauntlet, the 7 V Gerbing glove liners are meant to be worn under other gloves for added warmth. Heating elements are perfectly positioned along fingers and thumbs so the heat circulates throughout your entire hand for complete comfort. Gloves will reach a maximum temperature of 150°F and can last up to 5+ hours. Temperature control button allows easy access to the 3 heat settings providing adjustable warmth. Glove: 92% Polyester / 8% Spandex and Cuff: 75% Styrene-butadiene rubber (SBR) / 25%Polyester. Strategically placed heating elements use ultra-fine fibers for optimal heating performance. 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 and spandex material blend provides warmth and comfort. Waterproof zippered battery pocket stores a rechargeable lithium-polymer battery. Hand wash only and lay dry. High-quality stretchable fabric provides lightweight warmth, comfort, and versatility. Includes two rechargeable 7 V 2200 mAh Batteries and one charger kit.. Estimated Heating Times:. High (Red): 150°F - 2+ Hours. Medium (Yellow): 130°F - 3+ Hours. Low (Green): 110°F - 5+ Hours.