7IDP M1 HELMETLIGHTWEIGHT FULL-FACE PROTECTIONFrom the bike park to race days, the 7IDP M1 Helmet offers full-face protection for the most aggressive terrain. The M1 features a lightweight ABS shell, with 13 large ventilation ports to direct airflow through the helmet, with rear exhaust ports to let hot air escape. The large eye port increases the rider's field of vision and accommodates large eyewear. With 5 colors and a whopping 7 sizes, there's a 7IDP M1 Helmet for every rider. Features13 vents with front cool air intakes and rear hot air exhaust ports Lightweight ABS shell for lightweight, comprehensive protection Large eye port for a greater field of vision and to accommodate large eyewear SPECIFICATIONSSafety Certifications CE, CPSC, ASWeight900g (Size M)Sizing Size Extra Small Small Medium Large Extra Large Head Circumference (in)20. 75 - 21. 25"21. 5 - 22"22. 5 - 22. 75"23. 5 - 23. 75"24 - 24. 25"Head Circumference (cm)53 - 54cm55 - 56cm57 - 58cm59 - 60cm61 - 62cm | 7Idp | M1 Helmet Men's | Size Extra Large In Sea Foam Green