Helium standard has all the basics of the regular Helium without all the glamThis vent tunnel tested helmet will keep you cool and protectedRollsys 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 Rollsys system permits an accurate and progressive peripheral sizing adjustmentThe 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 can also be purchased separately to add you your Rollsys to increase your visibilityXstatic pads for a comfortable fit Inside In-mould (7-piece) construction19 cooling ventsWeight for a size medium of 260 gSize: Small 51-53 cm, Medium 54-56 cm, Large 57-60 cm