Standard insole or orthotic
Running shoes come with a standard insole. If this insole is not the right one for your feet, you can replace it. This can be replaced with a different insole, which can be bought separately in the sports shop, or with a custom-made insole. These orthotics are made by an orthopaedic shoemaker when the foot require extra support, for example, if you suffer from ‘flat feet’, or 'overpronation' in professional terms.
Support soles can prevent injuries, but if they are not really necessary or if they are not fitted properly, you may also experience other complaints. So get good advice on this from a sports doctor or physiotherapist.