Sparco's competition level RW-7 line of fire-resistant underwear is designed with both comfort and protection in mind. Constructed from a unique blend of soft, stretchable Nomex fibers that is treated with Sparco's unique X-Cool treatment, helping to draw heat away from the skin for enhanced driver cooling. Minimal seams on the one-size-fits-all balaclava so you don't notice it under your helmet!