What type of orthotic is best for high arch?

Custom orthotics: As with many things in life, there is good, better, best. This is true for orthotics too. Custom orthotics are by far the best. Make sure that your podiatrist uses plaster to cast your feet in the "subtalar joint neutral position" so you will receive orthotics that correct abnormal biomechanics. Over-the-counter arch supports are made for the "average" foot and the arch will be too low for you.