Keep your feet warm and avoid discomfort, numbness, and poor circulation in your extremities with Fieldsheer's Pro Compression Heated Socks. Powered by Calf Contoured 3.7v Powersheer Mini BT batteries that provide long-lasting warmth for up to 10 hours on a single charge. The nylon/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.