Lenz HEAT VEST 1.0 W Heated women’s vest: The Lenz HEAT VEST 1.0 W protects the body from the cold. Lithium battery packs (optionally available) are secured with buttons and heat the sewn-in heating element. The material ensures mobility and is windproof. The slim fit ensures direct heat transfer at the touch of a button when the vest is worn as a base layer. Lenz HEAT VEST 1.0 W