Keep your feet warm and avoid discomfort, numbness, and poor circulation in your extremities with Mobile Warming's Premium 2.0 Merino Heated Socks. Powered by the premium Comfort contour Powersheer Micro BT 3.7-Volt Lithium-Ion battery that provides long-lasting warmth for up to 10 hours on a single charge. The wool/poly blend materials are odor-resistant and wick moisture away from the skin to keep you comfortable all day, no matter how harsh the conditions. Since 1978 Fieldsheer has been designing and manufacturing rugged, performance-driven gear for avid outdoor enthusiasts, motorcyclists, workers, and more.