The Mobile Warming Men's Liner Gloves features a stretch polyester shell that has a slim fit making it easy to use under any glove. Includes a gauntlet hook and loop closure. Features a heating system built on the outside of perimeter of the fingers. The heating system has 4 selectable heat settings, with an integrated touch control button powered buy 7.4volt rechargeable lithium ion batteries. Capable of up to 8 hours of heat per charge, with a charge time of 4-5 hours. Battery packs are split to reduce wrist weight, these gloves are mobile device touch screen compatible.