Skateboard helmet, children's/adult bicycle helmet with removable lining for skiing, scooters, skating, cycling, rollerblading, skiing Suitable sports Skateboarding Roller skating Inline skating Scooter Biking Longboard Rollerblading Hoverboard Street dance Suitable users Adult / Men / Women / Youth / Kids / Children / Toddlers Colors and size chart Various colors and sizes for users of different ages, genders, and head circumferences Size: Choose the helmet size according to the head circumference classification S: 48-54 cm 18.9-21.3 inches M: 54-57 cm 21.3-22.4 inches L: 57-61 cm 22.4-24 inches Fully adjustable The crank adjustment dial in the back of the helmet and the chin straps are adjustable to fit the user comfortably from 360 degreesThe chin straps and chin pads are soft, so there's no need to worry about the straps scratching a child's sensitive skinThe strap buckle is easy to fasten and release Padding system The interior padding system, which includes 2 sets of interchangeable pads with different thicknesses of 5 mm and 8 mm, provides effective shock absorption and sweat absorption, keeping you cool while you work earingThe pads are removable for cleaning, keeping you away from odor and dustPlease use mild soap and water only for cleaning Suitable exercise Skateboarding Roller skating Inline skating Motorcycle Cycling Longboard Roller skates Air cushion board Street dance Suitable users Adults/Men/Women/Youth/Children/Kids/Toddlers Color and Size Chart Available in various colors and sizes, suitable for users of different ages, genders, and head sizes. Size: Choose the helmet size according to the head circumference category. S: 48-54 cm 18.9- 21.3inch M: 54-57 cm 21.3- 22.4inch L: 57- 61cm 22.4-24inch . Fully adjustable The crank adjustment dial on the back of the helmet and chin strap is adjustable, allowing for a 360-degree comfortable fit for the user.The chin strap and chin pad are soft, so there is no longer a worry about the strap scratching children's sensitive skin.The belt buckle is easy to fasten and release. Filling system The internal padding system consists of two interchangeable sets of pads with different thicknesses of 5mm and 8mm, which effectively absorb shocks and wick away sweat, keeping you cool while wearing it.The cleaning pad is detachable for cleaning, keeping it away from odors and dust.Please use only mild soap and water for cleaning.