We love sunny days and soaking up all the outdoor fun whenever we can, and so does this Radical Ray right here. Grab this hat and let the sunny times roll! - 5 panel trucker hat - Snapback for adjustable fit * SIZING TIPS * – Based off the average head circumference, by age (50th percentile growth chart) – Measure in centimeters around the child’s head just above the eyebrows Mini 6 -18 months (45-49 cm) Big 18 months - 5 years (49-53 cm) Super 5 -10 years (53-57 cm)