The MILWAUKEE® Heated WORKSKIN™ Midweight Base Layer-XL Kit is powered by a REDLITHIUM™ USB Battery with carbon fiber heating elements to create and distribute heat to the chest and back. Select from two heating settings with the one-touch LED controller for ideal heat in any environment. The Quick-Heat function provides heat 3X faster in the chest and upper back heating zones. Combining a double-lined polyester body and fleece-lined arms, the heated midweight 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. This midweight next-to-skin base layer kit includes, (1) XL Heated WORKSKIN™ Midweight Base Layer (405B-21XL), (1) REDLITHIUM™ USB 3.0Ah Battery (48-11-2131), (1) REDLITHIUM™ USB Battery Controller/Charger (50-59-2005),and (1) 3ft Micro-USB Cable and 2.1A Wall Charger (48-59-1202).