Following collection of baseline data, one of the researchers will begin fabricating the individuals in the experimental group for a custom-made PFO. The custom-made PFO will be completed by placing subject's foot in the equinos (plantar flexed and inverted) position. The custom-made PFO will be created from Aqua-Plast casting material. After heating the Aqua-Plast material, researchers will drape the material over their forearm to ensure that it isn't too hot for the subject. When the orthosis is hardened, the subject will place it in his/her shoe (after removing any shoe liners). Researchers will trim, stretch, or pad the orthosis as needed to make sure it is completely comfortable. If the orthosis is rubbing or is otherwise found to be uncomfortable, the rough edges will be reheated and smoothed with a finger or a grinder will be used to taper the edges. Subjects will be told to come in at any time to make any needed changes. Full instructions for construction of the custom-made PFO will be included.