In general, it’s advisable to purchase shoes that fit comfortably from the get-go. Buying a shoe that’s too small can lead to discomfort, and one that’s too large can impact stability. For tennis shoes, you’d want a glove-like fit that doesn’t restrict movement but also doesn’t allow for excessive foot movement inside the shoe. The Wilson Kaos, for example, is designed with a TPU cage and TPU heavy uppers for that snug fit. It’s also worth noting that our team found the outsoles provided ample support for changing directions efficiently.