Rudy Project Sterling Helmet - Le Fluo (Green/Blue, Small/Medium) Small/Medium: 54-58cm, 21.25"-22.8": 12oz / 349g Large: 58-62cm, 22.8"-24.4": 13oz / 374g Retention: R.S.R. 7 Disc Certifications: CE 89/686 EEC, EN 1078, CPSC 12.03, AS/NZS 2063 Made in Italy.