Gerbing 7V Heated Base Layer The Gerbing 7V Heated Base Layer is the perfect layer for cold weather riding. The on board temperature button controls three heating zones ensuring accurate warmth to the areas you need. A 7 volt portable battery supplies up to 8 hours of heat with a maximum temperature of 135 degrees. This base layer also is machine washable. Features: On board temperature control Machine washable 3 heating zones Left chest, right chest and back/collar Microwire heating technology 7 volt powered Heat lasts up to 8 hours Three heat level settings 135 degree maximum temperature 7V lithium battery and charger included