Bell 4Forty Air Mips Helmet Pro-level features for the real-world rider Bell's 4Forty Air Mips Helmet is built to deliver pro-level features at a real-world price point. The 4Forty Air features massive ventilation ports to keep you cool as you fly down the trail, and then climb back up. Thanks to the easily adjustable Float Fit(TM) system with integrated Sweat Guide and Ionic+ padding, the 4Forty Air has the all-day comfort you need. The MIPS(R) Evolve technology delivers industry-leading rotational crash protection, while the helmet's extended rear coverage offers added protection. Dedicated eyewear port and goggle compatibility allow you to run your favorite eyewear setup easily. Take to the trails with the Bell 4Forty Air Mips Helmet. Features Highly ventilated shell design for increased airflow on climbs and descents Float Fit(TM) system allows for easy adjustment Sweat Guide pulls moisture away from your brow and away from your eyes Ionic+ padding fights odor-causing bacteria MIPS(R) Evolve technology is integrated into the helmet's retention system and offers industry-leading protection from rotational forces in a crash Goggle and eyewear compatible with integrated storage solutions SPECIFICATIONSCore Material Fusion-In-Mold Polycarbonate Shell Protection Technology MIPS(R) Evolve Closure system Fidlock Buckle Safety Certifications CPSCIntended Use Trail, All-Mountain Weight360g (M)Sizing Helmet Size Small Medium Large Extra Large Head Circumference (cm)52 - 56cm55 - 59cm58 - 62cm61 - 65cm Head Circumference (in)20 - 22"21. 6 - 23. 2"22. 8 - 24. 2"24 - 25. 6" | Bell | 4Forty Air Mips Helmet Men's | Size Small In Matte Black Camo