This is a massage tool with ribs or ridges that you roll the foot over. It was designed by a podiatrist. Many people find it helpful for plantar fasciitis and those feet that are tired at the end of the day.
These are a splint or brace that you wear at night that are supposed to correct bunions. There is some debate if they do correct them or not, but the research shows that they can improve the angle of the big toe by a few degrees after a month of use.
Supination Resistance is a concept of determining the force needed to supinate the foot. This is considered important in foot orthotic prescribing as it is helpful to determine how much force if needed from the foot orthotic if the foot is overpronating.