What are personalized shoe inserts made from?

Orthotic Materials. There are many material that orthotics that are custom or personalized are made from. These will vary based on prescription, type of correction required with the device, the type of activities you do, medical conditions that might influence device and material selection (such as diabetes), and weight. Some examples of materials are polypropylene, graphite, cork, and many many more.
Inserts. Custom orthotics are usually made from a high grade plastic with a soft neoprin cover.