Using your Naot Frey sandals is easy. Just slip them on and go! Since they fit true to size (half - sizes should size up), you'll have a comfortable fit right away. When it comes to maintenance, keep them away from extreme heat as the cork footbed might be affected. You can clean the suede footbed gently with a soft brush. If you want to use orthotics, it's no problem because these sandals are orthotic friendly. And don't forget, the footbed is removable, so you can give it a breather from time to time. Also, as they're not slip - resistant, be careful when walking on wet or slippery surfaces.