OUR NEW OZONE HELMET (POWERED BY PLUSMAX) IS SPECIFICALLY DESIGNED FOR AIRBORNE SPORTS AND CONFORMS TO EN 966 STANDARDS.A full EPS impact foam liner provides shock absorption and is covered by an ABS shell for protection. The soft interior liner is moisture-wicking and the shell features 11 vents. It is available in XS-XL sizes, covering 54 to 62cm.NOTE: The Nutshell chinguard is sold separately. If you wish to order the full face helmet, you must specify this to your Ozone dealer.