Lightweight and durable, Petzl's Picchu is a climbing helmet designed for children between 3 and 8 years old. It is certified for climbing and cycling, both by American and European standards. The strap is adjustable, the openings ensure excellent ventilation and the helmet is equipped with clips to be able to attach signal lamps or other lighting systems. One size: 48-54cm. Instructions. Petzl Picchu kids' climbing and bicycle helmet