Plantar fascia is a band of fibrous tissue that plays a vital role in the function of the foot.
An overstretching of the this can lead to Plantar Fasciitis: inflammation of the tissue that causes pain in the heel and arch areas. Pain will be more severe in the mornings because the tissue is pulled and stretched after being contracted from inactivity (sleep).
Incorrect or misfigured arch supports will cause the tissue to overstretch.
With improper fitting support, the tissue is overly stretched and causes pain.
The properly fitting insole will support the foot— stopping elongation of this area and relieving your pain.