Loading... Please wait...Prefabricated, polypropylene, semi-rigid, functional orthotics are designed to control abnormal motion and alleviate common foot problems like plantar fasciitis, metatarsalgia and hallux limitus. Controling abnormal motion in the foot is the key to preventing arch collapse. Prolab orthotics are similiar to custom made orthotics in their design and rigidity and are common doctor recommended over the counter orthotics.