PROTECT WHAT MATTERS MOSTThe Ultralight is a lightweight helmet that will out last most other helmet designs. The tough outer shell is manufactured using specialized impact resistant polymers, which give the Ultralight its legendary longevity. Adjustable internal suspension and circular cross venting. Headlamp compatible. FEATURESWeight: 435 gramsRegular Size: 21.25 to 23.75Small Size: 18.8 to 22.8CEEN12492 and UIAA Certified