Much of your body heat escapes through the top of your head. Protect yourself with the NRS Mystery Helmet Liner. Under a helmet this liner will keep you warm and comfortable. 1-mm of DuPont® neoprene provides the core insulation for this helmet liner. The GlideSkin™ exterior sheds water to reduce evaporative cooling, increasing heat retention. Titanium laminate adhesive reflects and retains body heat for superior warmth. Lined with soft ThermalPlush™ fabric for all-day comfort. Full-cut style includes ear vents to improve hearing.