Smith Persist MIPS Helmet Stylish Helmet With A Tailor-Made Fit Whether you're going for a personal distance record, you're cruising the bike paths, a comfortable and protective helmet is essential. The Smith Persist MIPS Helmet uses high-tech features with a sleek and comfortable fit for any rider. The Persist MIPS uses KOROYD(R), a honeycomb-like structure that increases impact absorption while maintaining airflow and limiting weight, while MIPS(R) technology reduces rotational forces during certain impacts. The adjustable Vapor Fit system offers easy fit adjustment, while 21 optimally-placed vents work with internal air channeling to keep you cool and comfortable. Features MIPS(R) Technology helps to reduce rotational forces during certain types of impacts KOROYD(R)uses a honeycomb-like structure to absorb additional impact forces, with a lightweight and breathable construction Vapor Fit dial adjustment system offers 270deg fit adjustment with the turn of a dial Air Evac ventilation system integrates with Smith eyewear for fog-free lenses SPECIFICATIONSCore Material EPSClosure system Vapor Fit dial Safety Certifications CPSC, CE EN 1078Intended Use Road, Gravel Weight300g (Size M)Sizing Size Extra Small Small Medium Large Extra Large Head Circumference (cm)48 - 52cm51 - 55cm55 - 59cm59 - 62cm61 - 65cm | Smith | Persist Mips Helmet Men's | Size Medium In White