Orthotics are a custom made insert to help moderate the structure and function of your foot. Whether they are necessary or not is something we will get into in a minute.
First off, all orthotics are not created equal. They come in many different shapes and sizes, and can be made from different materials. In some cases such as for diabetic patients, orthotics should be made with soft cushioning, and in other situations they may be as hard as a rock.