Limited edition team replica versions of the Decibel helmet New Pro Fit retention system keeps helmet secure & is easy to adjust on the fly Wind tunnel tested 4th Dimension cooling system with Mouthport & In-Line vent configuration & deep internal vent channelling leading to rear exhaust ports keeps you cool. Clip-On visor included Triple In-moulded shell & foam engineered to maximise ventilation & weight savings Carbon-reinforced inner matrix enable larger deeper channelled vents In-Strap system minimises strap length & reduces strap contact improving comfort Light & simple U-Turn strap adjusters To fit head circumference 51-57cm