ADORABLE PROTECTION: This infant bike helmet features a multicolored space design little ones will love to wear. Sized for toddlers ages 1-3 with a head circumference of 44 - 50 cm. 360-DEGREE DIAL FIT: This little boys and girls bike helmet features an adjustable dial fit system and full-range interior padding providing a snug, secure fit that grows with your child. FOR COMFORTABLE RIDES: Designed with a super lightweight shell and multiple air vents, this helmet for toddlers works to keep kids cool and comfortable, while an integrated visor helps shield eyes from the sun. DURABLE, PROTECTIVE BUILD: Lower molded shell enhances rear coverage and durability. This kids bike helmet complies with the U.S.