The fit of the head cushion is critical to both comfort and safety. In general, the head cushion should be snug fitting and help hold the helmet to your head. The head cushion should also be adjusted so that it assists in the proper seal of the oral nasal mask to the face. Earphone holes are no longer present in the side pieces, but may be cut if the user prefers. The liner is made of a durable, nylon based material (black), plus, a webbing strap has been added to strengthen the snap mountings.