Their Heated Insoles updated to include seamless Bluetooth® connective via our MW Connect™ app, thier Premium Heated Insoles provide lasting warmth and extra cushion to provide all-day comfort and relief. By providing a thermal barrier against cold ground, our Premium Heated Insoles heat the toes to promote circulation, decrease numbness, and provide warmth for up to 7 hours on a single charge. Fieldsheer’s® Premium Heated Insoles take all-day comfort to the next level. Whether you’re in deep backcountry powder or an early morning job site, keep your feet warm and improve circulation to avoid stiffness, muscle fatigue, and soreness. Our ultra-thin design fits in a variety of footwear, from work boots to running shoes or ski and snowboard boots. Simply download the app on the App Store® or Google Play Store®, and you can control your heat settings to withstand even the harshest conditions for hours on end.