Ansai Mobile Warming Glasgow Heated Jacket - 2X/Silver The Windshark 4-way stretch high breathable, waterproof fabric provides additional flexibility needed in active outdoor sports Features three heating panels lined with steel alloy fiber elements Optimum placement with two panels on the chest and one on the back provide quick warm-up and even distribution of heat where needed most Includes one 7.4V 2.2Ah rechargeable lithium-ion battery and charger Battery features built-in 4-level thermo-regulating controls