Raskullz T-Chopz Triceratops Multisport Helmet will take your little rider back in time to the land of dinosaurs. This awesome 3D dinosaur helmet inspires your little dino fanatic to get outside and ride their bike skateboard or scooter! Recommended for ages 3-5 years old with heads measuring 48-52cm. Always take a head measurement. Head sizes and shapes can vary even within an age range. Using a helmet that doesn t fit can be dangerous.