Four-way stretch softshell fabric and patented Microwire™ heating technology, this great vest warms up in seconds with a touch of a button and provides hours of continuous heat to keep you warm during any cold-weather activity. Breathable, flexible, and durable with a water-repellent finish for performance in wet conditions. To enhance the warmth of the garment, the softshell is bonded to a fleece lining for added comfort and excellent next-to-skin feel. Four Microwire™ heating zones: Chest (2), Back (1), Neck (1). DWR finish repels snow and rain. Mid-layer or outerwear piece and heats for 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.