A smart liner glove with integrated heating elements, perfect if your hands always freeze even when wearing proper winter gloves. This liner is thin and flexible and fits under most lined gloves. They are sewn in stretchy polyester jersey with a laminated Inuheat heating system on the backhand, fingers, and thumb. The heat is adjusted in three steps via an app. The included battery clicks firmly into a holder on the outside of the wrist and links wirelessly to the heating system. The touchscreen-compatible coating on the index finger lets you use a smartphone and other touchscreens without removing the liner. HEATING TIME: Low: 6 hours, Medium: 3.5 hours, High: 2 hours. REMEMBER: The electronic components in the glove may interfere with avalanche equipment/transceivers. ** IMPORTANT** The liner must be worn inside an outer glove to avoid damage to the electronic components.