Heated Clothing Designed & Used by US, Motorcyclists. All our liners are the Signiture Series! Don't be confused by who invents and who copies. Because of an ingenious design, we have made each Liner capable of running with either a single or dual heat-troller. Yes they did copy this also! Please Take Note. Our Heated Clothing does not come with a Heat-troller or an ON/OFF Switch or even a Battery Harness. Our Heated Clothing Gets Too Warm to Use Without a Heat-troller. If you don't Have a Heat-troller, Remember to Order One. Yes, if you order the wrong size, you can exchange it! No extra shipping charge. For full technical information on the Warm & Safe Heated Liner, Go to the Heated Clothing page for the full information.