Alongside replacement soles, you can also find replacement shells available for KJ-XR3 and KJarmstrong XR models. These replacement shells are specifically designed to fit these models, including compatibility with older XR series models. It's important to note that for proper fit and functionality, it is recommended to replace both the upper and/or lower shells together. By offering replacement shells, Kangoo Jumps ensures that you can easily refresh and renew the outer structure of your KJ-XR3 and KJarmstrong XR rebound shoes, allowing you to maintain their performance and extend their lifespan.