Whether your child likes to climb or cycle, the Petzl Picchu helmet will protect their precious little head. This multi tasking helmet meets multiple safety standards, comes in two fun colors, and includes lots of stickers so your kid will be safe and stylish.. . Injection molded ABS shell is lightweight and durable expanded polystyrene lining provides excellent impact absorption. Adjustable chin strap, nape height, and headband provide a highly customizable fit removable foam liner adds extra comfort. Chin strap adjusts forward and backward and buckles off to the side for maximum comfort. Side openings provide ventilation to keep you cool, dry, and comfortable. Four optimally placed clips allow for headlamp attachment. Weighs only 310 g 10.9 oz.. Specifically designed for kids between 3 and 8 yeas old fits 48 54 cm head circumference. Includes two pages of stickers and one page of reflective stickers to personalize the helmet and make it even more visible. Meets CE EN 12492 UIAA climbing standards, CE EN 1078 cycling standard Europe, and CSPC safety standard cycling helmets for five year olds and older USA.