https://en.wikipedia.org/wiki/Orthotics:
"Manufacture and materials.
Orthoses are made from VARIOUS TYPES OF MATERIALS including thermoplastics, carbon fibre, metals, elastic, fabric or a combination of similar materials. Some designs may be purchased at a local retailer; others are more specific and require a prescription from a physician, who will fit the orthosis according to the patient's requirements. Over-the-counter braces are basic and available in multiple sizes. They are generally slid on or strapped on with Velcro, and are held tightly in place. One of the purposes of these braces is injury protection. [ ] ".

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