100% Altis Helmet Engineered for the Modern Mountain Biker Top of the line performance and safety shouldn't have to cost an arm and a leg. Fortunately, 100% shares the same mindset. When they set out to design their new Altis helmet they decided that they wanted to make a helmet that offers maximum performance, protection, and features but at a lower price point. The new Altis helmet will keep you cool all day long with its 14 massive ventilation ports. Smartshock Rotational Protective System has you covered in the event of an accident. Size specific EPS injection form has been optimized to fit each helmet size perfectly. The lightweight body keeps the overall helmet weight to a minimum. A multi-point adjustable visor keeps the sun out of your eyes while simultaneously providing a storage position for goggles. The easily adjustable ratchet fitting system and nexus snap-buckle strap allow you to perfectly dial in the fit of the Altis helmet. If you're looking for a quality trail ready helmet that checks off the most important boxes while keeping the price modest then this is the helmet for you. Features14 massive ventilation ports keep you cool on the trails Smartshock Rotational Protective System for additional protection Optimized size specific EPS foam provides a perfect fit without affecting safety Adjustable visor with a goggle storage spot Ratchet fitting system lets you dial in the hit of the helmet SPECIFICATIONSCore Material EPSClosure system Buckle Safety Certifications CPSCIntended Use CTrail Weight-Sizing Helmet Size XS/SS/ML/XLHead Circumference (cm)50 - 55cm55 - 59cm59 - 63cm How to Measure Measure around the fullest part of your head, keeping the measuring tape horizontal. | 100% | Altis Helmet Men's | Size Extra Small/small In White