Women's 7V Thermite Heated Fleece Vest 2.0 - Black - Medium Thermite 2.0 vest provides up to 8 hours of heat and is for staying warm during any cold-weather activity, Two-sided pile fleece provides insulating properties without weight; and its hydrophobic attributes hold less than 1 percent of its weight in water, Retains insulating properties even when wet, Polyester fleece resists pilling and has a honeycomb design structure , Four Microwire* heating zones: Chest (2), Back (1), Neck (1), Core fibers help conserve heat and wick moisture away from the body, Mid-layer or outerwear piece that can provide heat up to 8 hours, Battery Integrated Temperature Controller, Gerbing 7V Battery Heated Jackets & Vests Include: , 7V 3400 mAH Rechargeable Lithium-ion Battery Pack (25.16Wh), Wall Charger, Detailed Instructions, Gerbing Lifetime Warranty