Powered by Milwaukee M12 RedLithium Battery Technology, this lightweight and durable vest features an advanced heat technology system utilizing carbon fiber heating elements and Quick-Heat functionality, distributing heat 3X faster than market competitors to the chest and back. A hidden battery pass-thru pocket construction allows for front or back battery placement, increasing comfort and versatility. With re-engineered Axis Ripstop polyester fabric, this Milwaukee vest prevents tears from spreading while keeping the heat in and not adding bulk. The compressible, wind and water-resistant design can be used as an outer shell or mid-layer vest depending on the situation. Quick-heat function reaches selected temperature 3X faster One-touch LED controller with (3) heat settings per zone (high, medium, low) All day run-time - up to (12) hours of run-time with the M12 RedLithium 3.0 compact battery pack on low setting Washer and dryer safe Reinforced high-wear zones protect from abrasion and tears Includes: (1) M12 Heated AXIS Vest (1) M12 Battery Holder *Battery and charger sold separately. Available here.* Milwaukee Women's M12 Heated AXIS Vest - Black