A New Standard As pioneers of removable chin bar technology, The Bell team designed the Super Air R from the ground up to push the boundaries of performance and versatility-starting with Spherical Technology(TM). Spherical Technology&';s Ball-and-Socket design, powered by MIPSA(R), helps redirect impact forces away from the brain by allowing the outer liner to rotate around the inner liner during a crash. Throw in superior ventilation, a total weight that is 22%, or 144 grams, lighter than its predecessor, and an easy 2-click removable chin bar-and you&';ve got a true all-mountain performer. FEATURES REMOVABLE PROTECTIVE CHIN BAR DESIGNED FOR TRAIL RIDING ADAPTABILITY. ATTACHES WITH A SIMPLE 3-STEP CONNECTION PROCESS - NO TOOLS REQUIRED. WARNING: ALL CHIN BARS HAVE LIMITS, AND SERIOUS INJURY OR DEATH CAN OCCUR. READ OWNER&';S MANUAL CAREFULLY BEFORE USING YOUR HELMET. CIRCUMFERENCE - 55-59 CM FUSION IN-MOLD POLYCARBONATE SHELL PROGRESSIVE LAYERING(TM) ADJUSTABLE VISOR COUNTRY OF ORIGIN - CHINA OVERBROW VENTILATION(TM) FLOAT FIT(TM) PRODUCT WEIGHT 640G (SIZE M) CERTIFICATION COMPLIES WITH THE US CPSC SAFETY STANDARD FOR BICYCLE HELMET FOR PERSONS AGE 5 AND OLDER