About this item ? IMPACT RESISTANCE: XJD toddler helmet combines a super strong injection molded outer shell and a shock absorbing protective EPS foam inner shell. Safely protects kids little noggins from impact while providing comfort ? HEAD SIZE: X-Small: 18.11-20.08 inch(46-51 cm), suit for 1-5 years old toddler; Small: 20.47 - 22.05 inch (52–56 cm), suit for 5-8 years old kids. We offer two different sizes of toddler helmet in order to give a comfy fit for kids.(Use a string and tape measure to measure your child’s head before order) ? SAFE AND COMFORT: XJD kids bike helmet equipped with 14 air vents, integrated bug mesh in the front vents that will keep your little rider comfortable of exercise, reduce sweating. The button closure is easy to open and close. It's covered in soft velcro padding that's comfortable for little chins ? PERFECT CHOICE: Baby helmet perfect for bike, bicycling, longboarding, roller, and inline skating, skateboarding, scooter, rollerblading, pogoing. The flexibility of the strap makes it fit well for different requirements of boys and girls. It’s a good gift for Birthday, Christmas, Thanksgiving, Halloween ? ADJUSTABLE FIT: As your child grows, use the adjustable fit dial(turn right to tighten and left to loosen) on the helmet to keep the fit comfortable and their noggins safe while they cruise. After a day of riding, you can easily remove the detachable inner lining and wash away any sweat