Bike Helmet, Adjustable And Multi-Sport, 3 Sizes

3 sizes available. Small: 18.9"-21.3" (48-54 cm), suitable for kids 2-8 years old. Medium: 21.3"-22.4" (54-57 cm), suitable for youth 8-14 years old. Large: 22.4"-24" (57-61 cm), suitable for people aged above 14. ABS shell resists impact and high quality EPS foam provides shock-absorbing. Complies with U.S. Consumer Product Safety Commission Safety Standard for Bicycle Helmets for Persons Age 5 and Older. 11 top and side vents keep user cool and comfortable. Suitable for various outdoor sports such as cycling, skateboarding and so on. Fully adjustable, provided by the crank adjustment dial, 1 sets of pads with thickness, and length-adjustable chin straps.