Whether you are a seasoned cyclist, a gravel enthusiast, or an adventurous biker, the Giro Helios Spherical road bike helmet is designed to meet your performance and safety needs. Thanks to Spherical technology, which uses an In-mold construction powered by Mips®, the market-leading brain protection system, you will benefit from optimal protection against rotational forces in the event of a fall. Furthermore, the progressive layering system of the internal and external liners offers more comprehensive protection and performance. The helmet features 15 Wind Tunnel vents for excellent airflow, and our patented Roc Loc 5 Air adjustment system provides a perfect and comfortable fit. The XT2 antimicrobial padding ensures exceptional sweat absorption. Embark on all your road and gravel adventures with the Giro Helios Spherical helmet. Reflectivity: reflective details Circumference: 59-63 cm Construction: In-mold, independent liners with spherical design Injection-molded polycarbonate shell with EPS liner Full lower hardbody coverage Ventilation: 15 vents Adjustment system: Roc Loc® 5 Air Certification: Complies with US CPSC safety standard for bicycle helmets for persons age 5 and older; EU: CE EN1078 Highlights: Nanobead™ EPS foam, IONIC+™ antimicrobial padding Weight: 270 g (size M CPSC, CE) Giro Helios Spherical - Road bike helmet