The Ankeez™ is universal and is for everyone. It is made of nylon, latex and spandex. The sizes are approximate and are as follows: Medium: 9" long x 3.5" wide - Large: 9" long x 4" wide - XL: 9" long x 4.5" wide. The size selection is optional since it is open toe and universal. If your foot happens to be a little bigger in size, a bigger size would be ideal.
For time of use, you can always consult a medical professional if you have concerns. We think it is best not to wear it or more than 6 hours daily, or 3 hours if you feel any discomfort. When using the strap, it is best not to tighten it beyond your level of comfort. If by chance you have any other questions, please feel free to contact us at [email protected]