5 - 7 years. Protect children with these safe, attractive helmets! This premium helmet is classic and aerodynamic. Fits average 5 to 6 year old child with a head size of 19.68" to 21.88". Clean with mild, soapy water. Features reattachable visor to protect from the sun and other elements, 6 vents for air circulation and adjustable chin straps. Also includes Occipital Lobe Retention System for added stability.