The Milwaukee Workskin USB Rechargeable Heated Base Layer Long Sleeve in size L is a durable and high-quality shirt designed for men working in the construction industry. Made of polyester and fleece material, this black shirt provides warmth and comfort during cold weather conditions. The heated base layer technology, powered by a USB rechargeable source, ensures that the shirt stays warm throughout the workday, making it a reliable and practical choice for those working outdoors. Ideal for those looking for a reliable and efficient workwear solution.