Giro: THE POWER OF COOL The Merit™ Spherical is a high-performance trail riding helmet built around the ball-and-socket design of Spherical Technology™ to provide amazing ventilation, deep coverage and luxurious comfort.Helmets with Spherical Technology offer more comprehensive performance and protection with the combination of a Mips® brain protection system to redirect rotational impact energy. Plus separate inner and outer liners featuring Progressive Layering™ help manage high and low-speed impacts.The massive Wind Tunnel vents are combined with channels in the EPS foam liner, creating amazing airflow through the helmet to exhaust heat out, even on long, hot climbs.Fit and stability adjustments are fast and easy with the Roc Loc® Trail Air fit system, and plush Ionic+™ padding provides exceptional sweat absorption while combating odor with permanent anti-microbial performance. With all of these features, it’s an ideal choice for fast, flowy trail riding and hard pedaling. SPECS- Spherical Technology™- Mips® brain protection system- Progressive Layering™- Adjustable moto-style screw-in visor- Goggle gripper- Integrated eyewear grippers- Ionic+™ anti-microbial padding- Lightweight webbingCONSTRUCTION- In-Mold polycarbonate shell with EPS liner- Full lower hardbody coverageFIT SYSTEM- Roc Loc® Trail AirVENTILATION- 15 Wind Tunnel™ vents with internal channelingSUPER FIT™ SIZES- S 20”–21.75” / 51–55cm- M 21.75”–23.25” / 55–59cm- L 23.25”–24.75” / 59–63cmCERTIFICATION- Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older