Seirus Innovation 2205 Winter Cold Weather Thermax Headliner for Ultimate Head Protection Thermax Headliner uses technology from Seirus Innovation Thermax The Thermax Headliner is a 4-in-1 product: Helmet Liner, Balaclava, Skull Liner, and Neck-Up Warm, dry, wicking fabric covers head, face, and neck, to seal out the cold Ultra-thin Thermax fabric uses wicking fabric to keep you warm 4-way stretch allows the headliner to stretch and fit any head size comfortably