The Fieldsheer powered by Mobile Warming heating technology Peak BT Heated Vest is a low-cost unisex Heated Vest that is favored by many for its light design that allows it to function as either an outer shell or a base layer. Engineered to keep outside elements out, the Peak Heated Vest is constructed with Windshark, a Fieldsheer fabric technology designed to take on moderate weather, and a comfortable 4-way stretch material. Look to this highly breathable lightweight Heated Jacket to provide a water- and wind-resistant shell. The mid-weight Peak BT Heated Vest is thick enough to be worn as your outer layer and thin enough to be used under a larger ski Heated Jacket or heavy work coat. The Peak BT Heated Vest has integrated, concealed heating panels powered by a sturdy yet lightweight 7.4-volt Mobile Warming heating system. The 7.4-volt system has 3 heating zones, one on the back and 2 on the chest, that add heat to critical areas that keep your core warm. The Peak BT 7.4-volt heating system can provide temperatures ranging from 135°F on high to 90°F on low. On high, expect up to 2 hours of heat on high, and on low, the Peak BT can provide heat for up to 10 hours! The Peak BT has 2 ways to adjust the temperature. First, the built-in waterproof touch control button. With a simple button push, it lets you choose from 4 instant heat settings with a multi-colored LED indicator. Plus, we've incorporated Bluetooth control with our proprietary, free to download via App Store or Google Play Store, MW Connect app. Through the free MW Connect app, you can quickly toggle through all connected Fieldsheer powered by Mobile Warming technology garments and adjust individual heat levels to your liking. MW Connect app allows you to get real-time updates on battery levels and update your garments when new firmware becomes available. Throw it on under your camo, snow-Heated Jacket, uniform, or just wear it to the next ball game. The Peak BT Heated Vest is ready for any event.