Lazer Helium Gloss White XS-S fits 50-56cm Road Helmet. Lazer Helium Gloss White XS-S fits 50-56cm Road Helmet. Super Feather Light Weight Only 220g ! This was the lightest helemt on the market at this printing ! Patent-pending Rollsys fit system is easily adjustable and very comfortable ! Simply control the size and the comfort by turning the wheel on top of the helmet ! Internal Ventilation channels for optimum airflow with Antimicrobial and temperature regulating padding system 19 Large Vents ! Rigidity Brace System: Reinforcements for a superior helmet resistance against multiple impacts.Double Density EPS: Lighter and denser weight foam used in more or less critical areas for overall weight reduction !