Firstgear Heated Womens Jacket Liner - 90 Watt , Gender: Womens, Primary Color: Black, Size: 2XL, Distinct Name: Black, Apparel Material: Textile 951-2980 Available in 90-watt and 65-watt versions Designed to be plugged into a DC power source Heat-Trollers provide you with multiple ways to control the heat output in your heated gear Exclusive dual-zone heating system allows use of a single or the dual Heat-Troller without rewiring the liner Designed to be worn over a single layer of clothing like Firstgear Basegear, or other lightweight garment