Description [Shock absorption function] The sturdy ABS shell is impact resistant, and the high-quality EPS foam provides shock absorption performance. The helmet is suitable for a head circumference of about 55-62cm.[Cool and comfortable] 13 stylish vents, more ventilated, more aerodynamic performance, reduce sweating, keep users cool and comfortable.[Applicable to a variety of scenes] Suitable for various outdoor sports, such as skateboarding, bicycles, skating, scooters, roller skates, hoverboards, longboards, etc. Various colors for babies, boys, girls, children, teenagers, men and women.[Adjustable] Fully adjustable to achieve a personalized fit, provided by a crank adjustment dial, two sets of pads with different thicknesses and an adjustable length chin strap.