D.O.T. FMVSS No. 218 Certified and Labeled 12 Air Ventilation Channels across the Shell Super Light Weight of 700g/1.5 lb Detachable/Exchangeable Soft Padding No Fabrics inside/easy to clean Liner and Padding Made to fit all Goggle sizes Headset/Earmuff Intercom fits easily SUITABLE HEAD SIZE: XS: 20 - 20 1/2 inches, S: 20 3/4 - 21 1/4 inches, M: 21 1/2 - 22 inches, L: 22 1/4 - 22 3/4 inches, XL: 23 - 23 3/4 inches, 2XL: 24 - 24 1/2 inches, 3XL: 24 3/4 - 25 1/4 inches GRIT D.O.T. is the first helmet that combines all practical features you may seek and provides with the highest safety standards possible, on-road and off-road!