Description The REDLITHIUM™ USB Heated Base Layer is powered by REDLITHIUM™ USB Battery Technology with carbon fibre heating elements to create and distribute heat to the chest and back. A one-touch LED controller allows you to select from two heat settings, delivering ideal heat for any environment. The Quick-Heat function allows you to feel heat 3X faster in the chest and upper back heating zones. Combining a double-lined polyester body and fleece-lined arms, the REDLITHIUM™ USB Heated Base Layer provides a versatile layering piece for total body warmth. This battery heated shirt features raglan sleeves and seamless shoulders for an improved range of motion and comfort while working. Features: Midweight base layer fabric construction keeps body warm and dry Chest and upper back heat zones Fleece lined sleeves provides total body warmth Raglan sleeves and seamless shoulders for mobility and comfort Up to 3 hours runtime when used with REDLITHIUM™ USB 3.0AH Battery What’s Included: (1) REDLITHIUM™ USB Heated Base Layer Black [L4HBLBLACK-301] (1) REDLITHIUM USB 3.0AH Battery [L4B3] (1) USB Charger/Controller (1) Heavy Duty Cord & Adaptor