Micro Scooter Knee & Elbow Guards are for protection of elbows and knees from getting scraped while scootering, cycling or skating. These are adjustable guards that come in 2 sizes. They are secured by adjustable velcro straps. They provide padding and shell to give kids an extra protection from scrapes and bruises. Size S (Age 3-7 years) Weight <25 kg Knee 21- 27 cm Elbow 15-19 cm Size M (Age 6-10 years) Weight 25- 50kg Knee 25-31 cm Elbow 17-21 cm