The Fieldsheer® Sierra Heated Jacket is a stylish black quilted Heated Jacket with our tried-and-true Mobile Warming® 7.4-volt heating system. 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. 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 Sierra Heated Jacket is ready for any weather fall to spring, and if outdoor conditions get cold, put the heat on high. This garment runs small. We recommend you consult our size charts before purchasing and consider sizing up. Fieldsheer Heated & Cooling Apparel. Work and play in year round comfort.