My son used this helmet from age 3 while practicing riding his bicycle. Fortunately, he never fell and has no injuries. I'm selling it now because he's outgrown it. It's lightweight, easy to use, and made by the reliable brand, Montbell. [From the Montbell website] This is a lightweight cycle helmet with a colorful design, perfect for children who enjoy cycling outdoors or in the city. The in-mold construction, which integrates the outer and inner shells, provides both excellent strength and light weight. It has numerous vents to prevent stuffiness. It is also recommended for children who play on balance bikes. 【Materials】Outer shell: Polycarbonate, Inner shell: Polystyrene, Inner pad: Polyester 【Weight】225g 【Color】Yellow (YL) 【Size】Kids Free, Head circumference: 48-52cm 【Safety Standards】 European Standard (EN 1078): Complies with the European safety standard for bicycle helmets. Thank you for looking.