Using your Naot Frey sandals is a breeze. Just slip them on and enjoy the comfort. When it comes to sizing, remember that they fit true to size, but if you're a half - size, go up a size. As these sandals aren't slip - resistant, be careful when walking on wet or slippery surfaces. To keep them in good shape, clean them regularly with a soft cloth. If the footbed gets dirty, you can remove it and gently wipe it down. Avoid exposing the sandals to extreme heat or moisture for long periods, as this can damage the cork and latex footbed. With proper care, your Naot Frey sandals will last you a long time.