Firstgear Gen 4 Heated Pant Liner The Firstgear Heated Pant Liner is form fitting for optimum heat transfer to your body. This pant liner is breathable and wind-blocking thanks to the Gelanots fabric construction in the front. Delivering more heat in more places than any other garment, the Soft Heat Heating Panels have soft and flexible carbon shaped for maximum heat transfer. Heated sock connectors on lower leg are built in. For powering a heated jacket and pants in tandem, a coaxial Y-splitter can be added (sold separately) to allow just a single power connection be run to your bike. Features Form-fitting spandex fabric for optimal heat transfer and comfort Anti-bacterial, moisture wicking fabric Heat is generated over both thighs and knees and backside to warm vital areas of the body Integrated sock plugs stow in their own zipped pockets when not in use Dual zone heating: may be used with either a Single or Dual Heat-troller Powered by DC power source or battery pack Note: Heated pant liner only. Heat-troller and Y cable sold separately.