5 Heating Zones with Hand Warmer: Carbon fiber heating elements powered by Li-battery creates and distributes warmth to the chest, back, and hand warmers in front pockets Selectable Heating Levels：Two one-press LED controllers allow users to control the hand warmer and body warmer respectively, and choose from 3 heat settings, delivering ideal heat for any situation Quick-Heat Function and Last Long: Improves the traditional pre-heating drawback and allows users to feel heat in seconds. Up to 8 hours of running time in Low setting Water resistant and Breathable: DWR (durable water repellent) coating is added on fabrics to strengthen its water resistance but don’t reduce its breathability to a maximum extent.