For the youngest riders 40under 5 years41 protection is the first priority featuring giant39s new cinch wrap self adjusting fit system for a secure fit in mould polycarbonate shell construction and integrated visor for extra protectionfeatures protection in mould polycarbonate shell fit system cinch wrap ventilation 13 vents visor integrated padding pinch resistant strap padding for comfort extra age under 5sizesosfm 4046 51cm41