Tour Master Synergy 2.0 38&rdquo; Power Lead Heated Apparel Controllers and Miscellaneous Accessories - One Size Designed to operate in all weather conditions from a vehicles 12-volt electrical system Warmth without bulk or discomfort, making for a safer, more enjoyable ride Lightweight, flexible steel fiber heating elements provide safe, even warmth Expanding side panels help fine tune the fit and increase comfort Water-resistant, dual rheostat included