Look Out! The Raskullz Lil Big Shark helmet is on the loose. Cute shark graphic and cool blue colors make this especially adorable for your little shark. The helmet also features a sleek, easy-to-use dial fit system that offers an adjustable, secure fit with a quick turn of the dial. Recommended for ages 1-3 but will fit most with heads measuring 48-52 centimeters.. Features: Youth helmet recommended for kids 1-3 years old Fits most infants with heads measuring 48-52 cm (18.9-20.5 in.) Lightweight helmet works for riding bikes, scooters, skateboards, or rollerblades Easy-to-use dial fit system offers an adjustable and secure fit with a quick turn of the dial Adjustable straps help ensure a proper fit, and aerodynamic cooling vents for great airflow Complies with the U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 1 and Older (Extended Head Coverage)