They are prescription medical devices worn within your shoes to address biomechanical foot abnormalities such as trouble walking, standing, or running. They can also aid in the treatment of foot discomfort caused by medical disorders such as diabetes, plantar fasciitis, bursitis, and arthritis. Arch support inserts are often devices that are inserted in your shoes to support the arch of your foot in order to decrease or perhaps eliminate discomfort. Good Feet Arch Supports, in particular, are designed to support the four arches of the foot, positioning the feet optimally and balancing the body from the feet up.