Fieldsheer’s women’s Proton Heated Baselayer Shirt is an all-season favorite designed to be worn under a sweater, snow jacket, or other outdoor gear, with a sporty silhouette that allows it to be worn on its own. Powered by Powersheer™, the 7.4-Volt Lithium-Ion battery holds up to ten hours of power per charge delivering comfort no matter what nature throws at you and with a universal USB charging port. The subtle camouflage design adds a level of detail and sophistication to the front and back, while a 3/4 zip keeps the Proton Heated Baselayer Shirt securely in place. Integrated with our Mobile Warming Technology, simply activate one of four heat settings with our proprietary Bluetooth integrated MW Connect™ app. The Sweatsheer liner draws moisture away from the body, providing lasting comfort without sacrificing mobility. The poly fabric blend offers mobility, comfort and performance, keeping you in the field and doing what you love longer. Designed with versatility, function, and value in mind, Fieldsheer’s Proton women’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 stylish enough to be worn as activewear, the Proton Heated Baselayer is an essential piece of any woman’s outdoor kit. Our Powersheer™ 7.4-Volt Lithium-Ion battery is supported by a universal USB charging port and can provide heat for up to 10 hours 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. Perfect for every season, the Proton Heated Baselayer Shirt features a subtle gray camouflage detail across the front and back, giving it a sporty vibe. At the same time, a 3/4 zipper allows you to easily layer up or down