Fieldsheer's latest men's and women's Thermick Heated Baselayer Pants are a thoughtful combination of form, function, comfort, and value. Combined with a comfortable thermal fabric, the Thermick Baselayer Pant delivers all-day warmth while keeping you dry and protected from the elements. 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. Fieldsheer's Mobile Warming Technology is integrated with multi-zone heating elements, helps maintain circulation, decreases muscle soreness, and helps regulate internal temperature. Since 1978 Fieldsheer has redefined what it means for the modern explorer, and the Thermic Baselayer Pants are another step in that evolution. A cotton-poly blend combined with a thermal midweight layer and rib-knit cuffs and waist provides unparalleled comfort and performance, keeping you in the field and doing what you love longer.