True Fit 1-step adjustment 7 vents Extended coverage CPSC 1203 Bike compliant Fits head sizes 47 - 52 cm The Bell Sprout bike helmet is designed for kids aged 1 to 3, and fits head sizes 47-52 cm. The True Fit 1-step adjustment system provides a correct fit and the PinchGuard buckle ensures pinch-free buckling -- friendly to kids and parents alike. CPSC 1203 Bike compliant and featuring extended coverage and reflectors in back.