From downhill and enduro racing to fast laps at the bike park, the Project . 23 Carbon Helmet brings lightweight comfort and advanced protection to all your gravity endeavors. The ultra-light carbon fiber shell is built with an impressive 23 ventilation ports to keep you cool when you're charging hard, and the helmet features 7 Protection's S. E. R. T slip-plane system to mitigate harmful oblique and low-G impact forces.