Giro Dime Helmet Young shredders are important shredders. Put this lid on their noggin, set them free, and know that the Giro Dime helmet will return your precious little mischief-maker to you intact, cheery and bright-eyed. Tend to their runny nose instead of a cranial Boo-Boo. Giro packed all the features of their adult helmet, the Quarter, including the full-coverage impact-resistant ABS shell and thick EPS liner, into a high quality kid-size offering, the Dime. Features: Polyurethane Bumper Helps to Protect EPS Liner ABS Shell with EPS Fit Kit Padding 8 Vents HELMET SIZE CHART Size Small Extra Small Head Diameter (in) 20-21.75 18.5-20 Head Diameter(cm) 51-55 47-51 | Giro Dime Youth Helmet Size Small in Black