"Gear up for game day with the ActionHeat NFL 5V Battery-Heated Muff. Elevate your tailgating, stadium trips, or your trips into the hunting fields with this officially licensed, heated NFL muff. ActionHeat battery-heated apparel utilizes innovative technology designed to warm your core body temperature. Combining ultra-fine composite-fiber heating panels and a heat-trapping insulation layer, this ActionHeat muff brings advanced warmth and comfort for any chilly day. Simply charge the included power bank with the provided cord, connect it to the muff, and turn it on to experience 3 selectable heat levels and up to 7+ hours of toasty warmth. An extra USB out port even lets you use the 6,000mAh power bank to charge your phone or other USB device. Integrated LED indicator lights display battery life and charging status. As an official NFL-licensed muff, this heated muff lets you support your team while staying warm in any cold setting. 100% polyester. Belt strap size: Up to 51"". Machine wash (without battery). Imported. 100% polyester 2 powerful built-in heating elements made with ultra-fine composite fiber for hours of continuous warmth High: 140F for up to 3+ hours Medium: 125F for up to 5+ hours Low: 110F for up to 7+ hours Advanced heat-trapping insulation layer Power bank doubles as a phone charger even while providing heat 4 LED battery-life indicators ""Ghost Mode"" to turn off the LED light while keeping the heat on Water-resistant softshell Adjustable strap Elastic, ribbed cuffs Cozy insulation layer"