PETZL Picchu Climbing Helmet MULTI-USAGE HELMET: The PICCHU is a children's helmet, perfect for climbing and cycling. FITS YOUR KID: Specifically sized for children between the ages of 3 and 8 (48-54 cm headband). DURABLE CONSTRUCTION: Injection molded ABS shell is both lightweight and durable. Expanded polystyrene liner absorbs impacts. KID APPROVED: Featuring an adjustable chin strap, neck height, and headband for a comfortable fit. COMFORT IS KEY: Side openings for ventilation and narrow polyester webbing straps offer improved comfort.