More information can be found on the product page.
Visit Decathlon stores.
They are adjustable in 4 sizes:
28-31 feet 18-19.5cm,
32-35 feet 20-22cm,
36-39 feet 23-25cm,
40-43 feet 25.5-27.5cm.
Decathlon is currently offering a promotion. Broyx Urban 300 green inline skates are available for a whopping 40% off.