GIRO DESIGN, AND HIGH-PERFORMANCE INNOVATION FOR CORE ROAD CYCLISTS, GRAVEL ENTHUSIASTS, AND ADVENTURE RIDERS. DETAILS ADVANCED PERFORMANCE FOR THE ADVENTUROUS The heart of the Helios&';s extraordinary design and performance is Spherical Technology, which utilizes a ball-and-socket design powered by MipsA(R), the market-leading brain protection system that can help to reduce rotational forces. Spherical Technology allows the helmet&';s outer liner to rotate around the inner liner during a crash, and also allows Progressive Layering of the inner and outer liners to provide more comprehensive protection and performance. In addition to advanced head protection, the Helios&';s 15 Wind Tunnel vents provide exceptional cooling power that&';s enhanced by our patented Roc Loc 5 Air fit system and plush, antimicrobial XT2 padding for exceptional sweat absorption. It&';s the ideal match for your road and gravel adventures. SPECS REFLECTIVITY REFLECTIVE DECALS CONSTRUCTION INDEPENDENT, IN-MOLD LINERS WITH SPHERICAL BALL-AND-SOCKET DESIGN IN-MOLD POLYCARBONATE SHELL WITH EPS LINER FULL LOWER HARDBODY COVERAGE VENTILATION 15 WIND TUNNEL VENTS WITH INTERNAL CHANNELING FIT SYSTEM ROC LOCA(R) 5 AIR PRODUCT WEIGHT 270 (SIZE MEDIUM CPSC, CE) CERTIFICATION COMPLIES WITH THE US CPSC SAFETY STANDARD FOR BICYCLE HELMET FOR PERSONS AGE 5 AND OLDER E.U.: CE EN1078 HIGHLIGHTS NANOBEAD(TM) EPS FOAM IONIC+(TM) ANTI-MICROBIAL PADDING