Features： 1、1. Highly safe: fully comply with CPSC standards. It has an ABS outer hard shell and a thickened inner shock-absorbing EPS foam. This design can minimize the damage to the child's head in the event of a collision. 2、2. Adjustable size: It has a rotating dial that can adjust the helmet size to suit children of different ages. The size range is 21.2"-22.8" (54-58cm). Recommended for children aged 5-10. Important note: Even within the age range, the size, and shape of the head will change. Before buying, be sure to take head measurements first. 3、3. Ventilated and breathable: 17 independent vents can help your child reduce sweating and keep them cool and comfortable after hours of play or horse riding. 4、4. Comfortable and removable padding: The thick inner liner can provide very good comfort. The inner liner of the helmet is removable and washable, making it easy to keep clean. 5、5. Multi-purpose: designed for a variety of sports activities, such as skateboarding, roller skating, inline skating, roller skating, longboard, electronic board, electric scooters, cycling, etc. Specification： Material: ABS+EPS Size: M Adjustable head circumference: 21.2"-22.8" (54-58cm) Suggested age: 5-10 years old Suitable scenes: Designed for a variety of sports activities, such as skateboarding, roller skating, inline skating, roller skating, longboard, electronic board, electric scooters, cycling, etc. Package List： 1*Helmet