Experience all-day warmth with the Mobile Warming Men’s Baselite Baselayer Heated Shirt from Fieldsheer. Designed for outdoor enthusiasts, this versatile baselayer provides multi-zone heating at the chest and back, adjustable via a built-in touch control button with four heat settings. The stretchable, pilling-resistant jersey knit fabric ensures comfort and durability, while the breathable mesh liner with Odorsheer® technology keeps you fresh. A 7.4V Powersheer Mini® battery delivers up to 10+ hours of warmth, stored discreetly in a side pocket. Complete with flat seam stitching, a thumb garage opening, and USB-C charging, this baselayer is perfect for layering or wearing alone in cool conditions. Machine washable.