The updated Thermite 2.0 fleece heated vest is powered by Gerbing's patented Microwire heating technology that provides best-in-class heating performance and comfort. The improved Thermite 2.0 vest provides up to 8 hours of heat and is perfect for staying warm during any cold-weather activity. We love the stylish look and comfy feel of the Thermite Heated Vest, and we know you will too! Gerbing's Thermite fleece program is composed of a deep, soft pile obtained by heavily napping with wire brushes. It is a two-sided pile fleece, which provides air space giving good insulating properties without too much weight. A lightweight, warm, soft fabric, with hydrophobic attributes and holds less than 1% of its weight in water. It retains much of its insulating properties, even when wet. Unlike other synthetic fleece, polyester fleece is known for its ability to resist pilling, even after extended use. To update the fleece, we developed a honeycomb structure to give the fabric a more unique look, while maintaining functionality. Four Microwire heating zones: Chest (2), Back (1) & Neck (1) Exceptional warmth with lofted anti-pill fleece composition 135 F Maximum heat Core fibers help conserve heat and wick moisture away from the body Heats for hours Hydrophobic properties hold less than 1% of its weight in water Ideal mid-layer or outerwear piece Comfortable & Stylish Fit Battery Integrated Temperature Controller Charging Battery: (We recommend charging overnight for the first charge.) Charge 100% before use (a full charge takes about 3 hours). A red light will appear on the wall charger when charging. The red light will change to green when charged. Maintain at least 25% power when the battery is not in use. This practice will prolong the life of any 7V battery. Gerbing 7V Battery Heated Jackets & Vests Include: (1) 7V 3400 mAH Rechargeable Lithium-ion Battery Pack (25.16Wh) (1) Wall Charger (1) Detailed Instructions (1) Gerbing Lifetime Warranty Gerbing 7V Battery Heated Thermite Fleece Vest