Designed with versatility and function in mind, Fieldsheer’s® Merino men’s heated baselayer shirt delivers uncompromising performance combined with our Mobile Warming® technology. Thin enough to be worn under an outer layer, snow jacket, or rain gear but thick enough to be worn on its own, the Merino heated baselayer is an essential piece of any outdoor person’s kit. Our powerful Powersheer™ Standard 7.4V lithium-ion battery is supported by a universal USB charging port and can provide heat for up to 10 Hrs on a single charge. 4 Distinct heat settings put you in control, and with seamless Bluetooth® connectivity on our proprietary MW Connect™ app, you can stay warm in even the harshest winter conditions. Easily toggle between heat settings to find the perfect level of comfort on even the coldest winter days. Part of our Performance series, the Merino heated baselayer shirt keeps you in the field and doing what you love longer. Merino wool offers numerous natural benefits, including anti-static properties, better insulation than cotton and synthetic fabrics, and is naturally breathable, ensuring you’ll stay warm and dry all day long. Additionally, it’s an ideal fabric for layering as part of your outdoor equipment. The contoured hoodie provides an added layer of protection from the elements, while in-seam cuffed thumbholes make sure your hands stay warm without restricting mobility. Battery features Powersheer™ standard rechargeable lithium-ion battery (7.4V 2200mAh), up to 10 Hrs of power per charge, UL/CE certified, USB cable included, charge time 3-4 Hrs.