with carbon fiber heating elements and heating zones in the chest, back and shoulder area, up to 11 hours runtime with one M12™ 12V REDLITHIUM™ battery charge (3. 0 Ah), made of lightweight and highly durable fabric, can also be worn as a mid-layer, comfortable to wear even in harsh, rainy or windy weather conditions, optimized fit of the battery pocket allows the M12™ battery to be stored on the front or back for added comfort, multiple heating zones - 5 sewn-in carbon fiber heating elements distribute heat to key areas, easy OneTouch temperature adjustment - 3 heat levels: high, medium, low, machine washable and dryer safe, battery controller included, 100% system compatible with MILWAUKEE® M12™ batteries