The Milwaukee M12™ HHBL4-0 Heated Hoodie has 3 sewn in carbon fibre heating elements that create and distribute heat to core body areas. Made from durable cotton (53%) exterior with durable reinforced utility pockets and polyester fleece (47%) lining to withstand tough outdoor conditions. The easy one-touch heat controller has 3 heat settings: High, Medium, Low. Meaning its simple to use. It also features a integrated cell phone pocket and a hidden battery pocket to place M12™ battery in front or rear for increased comfort In autumn and spring the hoodie can be worn as a rugged outer layer. In winter, it is best as a base layer that allows to shed bulky undergarments while generating and holding heat close to the body. This hoodie is machine washable and dryable. Powered by a M12™ battery (NOT supplied). When using a M12™ REDLITHIUM™ 3.0 Ah battery pack you can get up to 11 hours of heat on a single charge. Flexible battery system: works with all MILWAUKEE® M12™ batteries. Battery holder included.