Get ready. This is the deluxe line edition of the best selling O2 helmetFeaturing the stunning O2 helmet in the unique 'line' graphic, with all the kit includuedIncludes the unique patented Lazer Clear Aeroshell in the box, along with Lazer's proprietary Cappuccino lock, a red light integrated in to the Rollsys fit system, an extra aquagel pad is in the box, along with a matching classic cycling capReady when you are, whether it's a commute, sportive or you're attaching an Aeroshell and sprinting for the win, the O2 helmet is ready for itCompact profile, light weight, well vented, and a great fit, all the features of a helmet twice its priceRollsys is Lazer's very own award winning fit system: simply control the size and the comfort by turning the wheel on the top of the helmetThe fit of the helmet will be symmetrically tightened up without any pressure points on the head, with a simple one-handed adjustmentBy taking away the retention system at the back the Rollsys system is also the perfect solution for people with a ponytailA small light is included in the Rollsys dial to increase your visibilitySize: Small 52-56cm, Medium and Large 55-61cm