Fits head sizes 48 - 52 cm vented for cool comfort CPSC Compliant Ages 3+ R Exclusive, only available at Toys R Us Canada. Get ready to ride safely with this Ryde helmet! This Ryde toddler bike helmet has vented holes to keep the toddlers head nice and cool. There is an adjustable chin strap that has a buckle lock to hold helmet in place. For ages 3+ and fits head sizes 48-52 cm. For warranty or part questions, please email service@stoneridgecycle.com