The "Grandeur", this helmet is for riders who love to communicate with nature. Its massive air vents specifically design for grand endurance, challenges and rough terrain. A kind of helmet exceptional made for mountain trail blazing. Specification Sizing- # L-M 56-62 cm Fit and Stability-ACULOCK System Construction- Inmold Ventilation- 19 air vents Weight- 256 g Certification- CE EN-1078 Certification