The Genesis comes in two sizes, which Lazer refers to as Medium and Large, and this wouldn't be possible without the patented Rollsys retention system. Unlike other designs that press a retention system onto the back of your head, the Lazer Rollsys uses a smooth thumb wheel at the top of the helmet that connects to a progressive sizing system.
Rollsys loosens/tightens the retention system around the entire circumference of your head. Design-wise, the Rollsys is remarkably clean, and it adds no appreciable weight to the helmet. Those who've worn them are astonished by the same thing — the comfort of having retention pressure increased/decreased evenly throughout the entirety of the helmet. The Genesis has 19 generous vents for ample ventilation, and a more minimal silhouette than other helmets, as it's not as tall and not as wide.
The Genesis also uses X-Static pads to keep you comfortable, and to prevent things from getting too stinky, they're antimicrobial. The Lazer Genesis Helmet is available in the sizes Medium and Large — the former is for head circumferences ranging from 52cm - 58cm, and the latter is for 58cm - 61cm heads. It is available in seven colors and comes with a helmet bag and spare set of X-Static pads.