with carbon fiber heating elements and heating zones in the chest and back area, up to 11 hours runtime with one M12™ 12V REDLITHIUM™ battery charge (3. 0 Ah), durable TOUGHSHELL™ stretch fabric, optimized battery pouch fit allows M12™ battery to be stored on front or back for added comfort, multiple heating zones - 3 sewn-in carbon fiber heating elements distribute heat to key areas, easy OneTouch temperature adjustment - 3 heat settings: high, medium, low, machine washable and dryer safe, battery adapter included, 100% system compatible with MILWAUKEE® M12™ batteries