Lenz Men's Heated Vest 1.0The heated vest for men guarantees a warm back at the touch of a button. The integrated heating element is not noticeably connected to the lithium packs (optionally available), which are located under the chest ribs. The sleeveless vest has a slim cut to guarantee direct heat transfer. It is worn as the bottom layer. The breathable material is quick drying and abrasion resistant. In warmer temperatures, the heat vest 1. 0 men can be worn without the