Features 2-In-1 helmet for normal cycling use and MTB, BMX, skateboard, mountain biking and dirt bike. High quality and extremely durable for all round protection when cycling, skating, BMXing & scooting. Aerodynamic design with 13 vents for increased functionality in a range of bright & vibrant colours. Sizes to fit child, kids, youth, teen, adults 5-8 and more ages. Detachable chin guard with a patented locking mechanism for a secure grip and easy one click release. Specification Material: PC + EPS Lining: polyester fiber Weight: about 420g Head circumference: about 52-56cm Internal size: about 17.5 * 20cm There are 13 vents, suitable for ages 5-10 years How to Use Package List 1 pcs Kids Helmet Note Due to the different monitor and light effect,the actual color maybe a slight different from the picture color. Please allow 1-2cm differs due to manual measurement.