Using these OOFOS OOriginal thong sandals is easy. Just slip them on after a long day of adventure to give your feet a break. When it comes to sizing, make sure to follow the guidelines we provided in the product description to get the best fit. For maintenance, you can simply throw them in the washing machine as the foam is machine - washable. This helps keep them clean and resistant to moisture and bacteria. As you use them, you'll notice how they support the natural movement of your feet, reducing stress on your feet, knees, and back. Remember, these sandals are designed to help you recover, so use them after activities to feel refreshed for your next adventure.