We took our proven, tried and true style, The Classic, and miniaturized it for the youngest of rippers. Our newly added Twist Fit system provides dual-direction ratcheting adjustment, for a more custom fit without having to mess with changing liners. We also added a magnetic Fid-Lock buckle which is easier to use for little fingers and eliminates those pesky neck pinches. Available in 2 sizes from 47cm-54cm with 2 sets of pads for a more custom fit. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older SHELL High-Impact ABSLINER EPSVENTS 11 Open VentsINTERIOR Heat-Sealed Premium PadsFIT 2 sizes - Youth Small (YS), Youth Medium (YM)CERTIFICATIONS ASTM 1492/1447, AS/NZS 2063:2008, CE 1078