Just get out your bike the same fit system used on our 150 helmets is available on the vandal featuring the rollsys retention system rollsys is lazer39s very own award winning fit system simply control the size and the comfort by turning the wheel on the top of the helmet the rollsys system permits an accurate and progressive peripheral sizing adjustment the fit of the helmet will be symmetrically tightened up without any pressure points on the head with a simple one handed ad