The Fieldsheer® powered by Mobile Warming® heating technology Backcountry Heated Jacket made with Primaloft® synthetic down offers a low-profile 7.4-volt battery. With Waterpell® technology, water bounces off the garment. Primaloft® is a down alternative made from recycled materials into ultra-fine insulative fibers. The Backcountry is stylish enough to wear on its own during day-to-day use, but light and amply compressible to also wear as a base layer under your favorite rain or snow Heated Jacket. 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. The Backcountry comes as a complete package with a 7.4 volt battery, charger, and stow bag. The Backcountry provides instant heat when the weather turns cold, keeping you outdoors and enjoying your favorite activity.