CPSC approved 23 vent helmetLarge front vents, and lower coverage on the rear make for a well rounded off road helmetHead Lock adjustable dial retention system for fine tuning the fitIntegrated removeable visorAll PurposeIn-MoldSM/MD 21-1/4 to 22-3/4` (54 to 58 cm)Black/Grey23Head LockUPC/EAN/GTIN: 888571120279