[Adjustable inline skates] -s/m/l, and each size is adjustable, please be sure to choose the correct size by checking the attached size chart picture.[Size] There may be deviations in manual measurement, it is best that the length of the foot is less than 1 cm of the roller skating shoes. S: shoe length is 18-20.5cm, suitable for 3-6 years old, M: shoe length is 21.5-24cm, suitable for 6-11 years old L: shoe length is 24-27.5cm, suitable for adults.[Set] Our skates will be given a safety helmet and sliding protective gear to prevent children from sliding and falling and injured. There are also 3 roadblocks to help children practice sliding skills.[Adjust the length] Don't forget to adjust the length of the boots through the buttons before wearing. You will find that its operation is so convenient that children and teenagers can use it for many years even if their feet grow up.[8-wheel lighting]-Our children's inline skates are equipped with four lighting wheels, which will automatically light up when you start skating. The lights are powered by rolling wheels, no need to change batteries, just imagine how cool it would be to be as bright as lightning in the darkFree skates + single brake designThe single brake is installed on the right foot instead of the two brakes installed on the left and right feet to prevent the danger of falling backwards during braking.