Plantar Fasciitis Insoles
The problem with orthotics and arch supports that are used to treat flat feet, fallen arches, and painful feet, is that they don't support the arch of the foot, where it actually needs to be supported. To properly support any arch, such as a bridge over water, either end of the open space should be supported. In the case of the foot, the heel and balls of your foot should be supported, but not the space in-between the ends of the arch.
Plantar fasciitis is the most common cause of heel pain, and is commonly found in runners and people who wear improper footwear. The weight balance on the foot is 50% on the heel and 50% at the base of your toes. Having support and cushioning at those points is very important. The arch of your foot isn't designed to take any impact--so having shoes that put pressure on your plantar fascia with every step will create more inflammation in the foot, not heal it.