THE SYNTAX MIPS® COMBINES A TOUCH OF EUROPEAN FLAIR WITH SLIGHTLY DEEPER COVERAGE AND HIGH-PERFORMANCE FEATURES — ALL TUCKED INTO A VERY SLIM DESIGN. THE FIT IS LUXURIOUS AND SECURE, THANKS TO OUR HIGHLY ADJUSTABLE ROC LOC™ 5 AIR MIPS SYSTEM THAT ALLOWS YOU TO CUSTOMIZE FIT AND FEEL FOR GREAT STABILITY AND LONG-RANGE COMFORT WHILE PROVIDING AN ADDED MEASURE OF PROTECTION FROM ROTATIONAL FORCES IN THE EVENT OF AN ANGLED IMPACT. THE OUTER SHELL IS MOLDED FROM A TOUGH POLYCARBONATE THAT'S FUSED PERMANENTLY TO THE EPS FOAM LINER USING OUR IN-MOLD CONSTRUCTION PROCESS TO ENHANCE DURABILITY AND VENTILATION WITHOUT EXCESS BULK. CIRCUMFERENCE 51-55 CM CONSTRUCTION FULL-WRAP IN-MOLD POLYCARBONATE SHELL WITH EPS LINER FOUR POLYCARBONATE HARDBODIES VENTILATION 25 WIND TUNNEL VENTS WITH INTERNAL CHANNELING FIT SYSTEM ROC LOC® 5 AIR MIPS® PRODUCT WEIGHT 340G (SIZE MEDIUM CPSC)|280G (SIZE MEDIUM CE) CERTIFICATION COMPLIES WITH THE US CPSC SAFETY STANDARD FOR BICYCLE HELMET FOR PERSONS AGE 5 AND OLDER E.U.: CE EN1078 HIGHLIGHTS IONIC+™ ANTI-MICROBIAL PADDING FEATHERWEIGHT WEBBING WITH SLIMLINE™ BUCKLE