Children's Age Group: Dial-Fit Retention System Adjusts to Fit Children's Head Circumference 19.68-22.4450-57 cm) - Recommended for boys or girls ages 5-88-14. To ensure the best helmet for your child, measure your child's head circumference before purchasing. SAFETY AND PROTECTION: This kid's helmet is certified to the US CPSC standard. Lightweight multi-density EPS foam padding absorbs impact to minimize impact damage to children's heads in a crash, thickened soft heat-sealed lining and chin pad effectively protect children's heads from chafing, elongated rear shape Provides full protection to the back of the head if you fall on the ground from a bicycle, scooter, skateboard, roller skating. VENTILATION AND LIGHTWEIGHT: The 15 vents on this kids bike helmet is the ideal construction to provide optimal ventilation for kids to exercise on the wheels, your boy/girl feels cool during their outdoor sports. At the same time, we want your baby to enjoy a happy time in sports with no weight bearing, this 240g children's helmet (with visor) will hardly be noticed on the head and is one of the good choices for your child/nephew/grandchild/ Granddaughter/friend's child. Features: Removable Visor, Quick Release Clips, Single Watch Dial Fit System, These Bonuses Guarantee The Child Is Easy To Use This Helmet After 1-2 Tries And Familiarize With The Correct Fit To Ensure His/Her Own Safety.