The Gravity-Defying Boots.

These boots have a patented T-spring system that transforms walking, jumping, or running into an exhilarating bounce that builds balance, burns calories, and strengthens muscles. The boots buckle over athletic shoes and can be used by children and adults alike. Gentle on joints and bones, the boots have a high-traction, non-marking tread for use indoors or out. For use on dry, flat surfaces while wearing appropriate safety gear (not included). Imported. (6 lbs.)
Small. Fits junior shoe sizes 9-13, youth sizes 1-5. Blue. Weight range: 33-55 lbs.