The Raleigh Glyde cycle helmet combines style & safety. Its robust yet sleek design is perfectly suited to your city commute. Key Features: Robust hardshell construction,16 vents for 360 degree cooling,Weight: 370g,Dial fit head ring fitting system,Nexus chin buckle with comfort pad,Anti pinch buckle,Large 6 LED integral rear light with steady & flashing modes,Cam lock side straps .Sizes:M - 55-58cm,L - 59-61cm.