The Women's Mobile Warming Softshell Vest from Ansai is designed to provide the warmth you need to stay active and enjoy outdoors pursuits in the extreme cold. The lightweight vest is equipped with an integrated, battery-powered heating system that includes two heat panels on the chest and one heating panel on the back for even heat distribution where it is most needed. The vest is constructed with four-way stretch, breathable, and waterproof Carboflex fabric that is designed for a sport ready performance whether you're downhill skiing, running, or skating. Designed to provide the exact level of warmth you need, the Warming vest is equipped with four-level thermo-regulating controls and provides up to 10 hours of warmth per battery charge. The heat can been turned off during intense exertion and then turned on when you're at rest, on a ski lift, or pausing for a meal. The vest comes with one 7.42V 2.2ah rechargeable lithium-ion battery and a charger.