Bicycle helmet roller skating child helmet hard hat

[Size] L/Average code, head circumference 56-61cm, head width 18.3cm, head length 23cm, adjuster knob, adjustable head circumference size

[Material] EPS foam + PC sheet integrated molding, built-in sweat lining, nylon webbing and PP material conditioner

[wind tunnel] 18 wind holes

[weight] about 220G