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