This helmet has soft fleece padding and safety EPS impact absorption to provide ideal safety even for the youngest children. The innovative magnetic fastener makes it easy for children to open and close the helmet and prevents the skin from being pinched. Helmet includes adjustable straps to ensure the best fit for your child. The rear side of each helmet features a bright red LED light to make sure your child is visible in low light. Baby Helmets XXS-S are best for children with head sizes ranging from 17.7"-20". Kids Helmets S-M are best for children with head sizes ranging from 20"-21.7".