Available in Regular and Tall sizes. Gerbing garments plug right into the electrical system on your motorcycle, snowmobile, ATV, boat, or even airplane for an unlimited source of power and warmth at any temperature, any speed. Heated pant liners provide ultimate warmth and comfort while riding in cold weather. Pant Liner makes a great mid-layer piece and constructed of windproof, durable, mini ripstop nylon fabric that fits close so the rider can wear it comfortably under riding pants. Four Microwire™ heating zones in the leg and hip. Connect Pant Liner to an EX Pro Jacket or Jacket Liner to create full-body warmth. Connections at the hem of each pant leg allows the connection of heated socks and insoles. About the Gerbing 12V Power System: The Core Heat 12 thermovelocity system is powered by a simple connection to your vehicle's DC power system. Core Heat 12 technology connects to your motorcycle, snowmobile, ATV, boat, or even airplane to keep you warm at the temperature of speed.. Battery Harness and temperature controller required for stand-alone operation (sold separately).. We recommend the use of a temperature controller with this product. Failure to do so may cause discomfort & burns.. Gerbing Microwire Heating: The Microwire system is the most durable and efficient thermo-technology platform ever developed. Products incorporating Microwire technology utilizes patented micro-sized stainless steel fibers intertwined and encased in a proprietary waterproof coating. Gerbing Microwire technology will provide even heating for ultimate comfort. We recommend the use of a temperature controller with this product. Failure to do so may cause discomfort & burns..