The G-Tech Heated Hand Warmer Pouch Stealth x Realtree 3.0. G-Tech features 3M polyfill heat-capture material and a waterproof zipper, as well as an upgraded battery and charger, for superior performance when temperatures drop. The 7.4v rechargeable Lithium battery provides constant heat for up to 12 hours. It is constructed of waterproof 600D Polyester backed with a PVC coating. Available in three Realtree patterns.