Better Me Cartoon Roller-skating Skating Kick Scooter Kids Helmet Shark,4 Colors PC Shell,Vent. High-density EPS,High strength Drawstring,Regulator. Dial fit retention system offers 100% adjustability for larger or smaller heads, has lots of ways to adjust it. There is a dial that adjusts the head size, adjustable chin strap, and the side burns over the ears adjust to be comfortable. The helmet is well padded and is super fun and cute. it is usually used for many kind sports such as bicycle,Roller-Skating,scooter