Contoured for medial foot instability The TRIO Easy Fit provides all the support required for the medial side of the foot without the need for lateral features. As a result this narrower device provides easier fitting in a wide variety of shoes. The TRIO Easy Fit orthosis is contoured to improve the ability of the medium arch foot to function correctly and eliminate the cause of pain. Additional control of pronation forces is provided by extra medial posts that are supplied with each pair.