b'S-M 55-58 cm / 21.7 - 22.8L 59-61 cm / 23.2 - 24S-M g: 250 / oz: 8.8L g: 300 / oz: 10.6CERTIFICATION: CPSC 12.03Nytron15 VENTS DIVIDER PRO FASTEX SYSTEM RSR 10 M FREE PADS FLOW THROUGHSIDE BUCKLES CLOSURE BUCKLE ADJUSTABLEINTERCHANGEABLE VENTILATION RETENTIONCOMFORTSYSTEM PADDINGHELMET COLORSINCLUDED: Microfiber pouch Free pads interchangeable RSR 10 M Retention SystemBLACK MATTE WHITE MATTEHL 77 00 01 US | 340S-M HL 77 00 11 US | 340S-MHL 77 00 02 US | 340L HL 77 00 12 US | 340LPINK FLUO MATTEHL 77 00 91 US | 340S - MHL 77 00 92 US | 340LSPARE PARTSFREE PADSRSR 10 M Interchangeable internal padding Retention System KitBlack Mirror ChromeC0 00 04 51 | 20 C0 00 04 21 | 1580'