DetailsFieldSheer Men's Size Chart The Fieldsheer® Bluetooth®-enabled 7.4-volt Shift Heated Jacket is a stylish button-up fleece heated hoodie that can be worn in almost all situations. The Shift heated hoodie Heated Jacket is made from a blend of 65% cotton fleece with a soft texture and high insulative properties. It has stylish looks for around town or up in the mountains. 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. From the trail to the office, the Shift Heated Jacket keeps you warm on or off the beaten path.