Whats the benefit of orthotics if i have high arches?

Support: An orthotic may properly support your arch which can be helpful if you are having pain. The orthotic may also improve the biomechanics of your lower extremity.

A couple: Orthotics will support the arch and take pressure off the muscles and tendons of the foot.

High arches: High arched feet are poor shock absorbers. Orthoses may help with that, making you feel better.