Worn a few times indoors for lessons. There are no noticeable stains, and they are still in good condition. ⇩ Quoted from the Asics website below ⇩ Indoor shoes CP MINI (TUU107) The "PRESCHOOL" series is designed for children aged approximately 3-7 years old who are developing the arches of their feet and learning the correct way to walk. These are indoor shoes suitable for physical education classes and sports classes. They emphasize heel stability and feature a three-dimensional insole. The insole incorporates Shine Up, which has antibacterial and deodorizing effects, and Water Magic, which quickly absorbs and disperses sweat to maintain dryness. This keeps the inside of the shoes comfortable. They are easy to put on and take off with a single-strap design, and the upper uses Russell mesh, which has excellent breathability. The outsole has grip and durability that allows for outdoor wear.