The Fieldsheer® 12-volt Summit Duck Down Heated Vest with integrated Bluetooth® wireless connection features our premium heating system encompassed in the highest quality, responsibly sourced, duck feather insulation. It has classic down Heated Vest looks and performance features and is constructed of a lightweight 100% Nylon Outer Shell with ultra-warm Duck Down core. 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 Summit Heated Jacket provides instant heat when the weather turns cold, keeping you outdoors and enjoying your favorite activity. The Summit Heated Vest provides instant heat when the weather turns cold, keeping you outdoors and enjoying your favorite activity.