What to avoid: Nearly anything with excessive flexibility in the only. Not merely does this usually translate to fewer arch help, Fishkin suggests it may make instability, forcing your foot to work harder to remain in place. The extra strain may result in a tighter, much more irritated plantar fascia.   https://www.theorthopaedicandpainpractice.com/treating-foot-arch-pain-with-modern-orthopaedic-pain-management-techniques/