DURABLE DESIGN - The kangaroo shoes feature rugged rubber grips on the sole for better traction. It also features a heavy duty frame and secure adjustable fastening straps. STAYING FIT - The bouncy boots for kids is a fun way to keep in shape. These shoes will help you burn calories, reduce body fat and strengthen your legs and thighs muscles. SAFETY - To prevent injuries, we recommend always using a Helmet and protective gear while jumping. Children must be supervised at all times by and adult while using the bouncy shoes. GREAT PARTY IDEA - Invite some friends and jump together, or buy multiple pairs and use it for a party activity. Suggested age: 5 and up. GREAT FOR ALL CHILDREN - The Jumping Shoes come in the following sizes; Small (31-34 EU) | Weight limit of : 45- 80 Lbs. Medium (35-38 EU) | Weight limit of : 55 -100 Lbs. Large: (38-42 EU) | Weight limit of : 99-145 Lbs.