Kask CPSC 50 Helmet HANDMADE IN ITALY - Crafted with the worlds finest materials and hours of pain staking hand work ALL ABOUT FIT - Kask's Up and Down Fit adjustment system gurantees a perfect fit SAFETY FIRST - All Kask Helmets are CPSC certified, which means they meet and exceed all US safety standards for bicycle helmets STAY COOL - 24 inlet vents provide optimal ventilation to keep you cool Medium Fits 48-58cm (18 7/8" - 22 78") and Large fits 59-62cm (22 3/8" - 24 1/2")