AFX FX-17Y Unisex-Child Off-Road-Helmet-Style Helmet (Rocket Girl, Small) Lightweight Composite poly-alloy shell Revolutionary design based on the fx-86r with additional inner ventilation channels with new twin-top exhaust vents Fully removable liner and cheek pads Replaceable Screw-On visor Six high-flow ventilation points (53-54cm 6 5/8 - 6 3/4 hat 20 7/8" - 21 1/4")