Design & Technology: Dinosaur-inspired graphics printed with glow-in-the-dark paint create a fun and unique look 3D flexible 2" mohawk helps pull the look together Easy-to-use Dial Fit System provides an adjustable and secure fit with a turn of a dial Adjustable straps and aerodynamic cooling vents help keep your toddler comfortable Recommended for riders 3-5 years old, but will fit anyone with a head measuring 48-52 cm Complies with the US CPSC Safety Standard for Bicycle Helmets for Persons Age 1 and Older