The Molded ABS Footplates are made out of a rigid plastic that surrounds the back of the heel. There is a strap that crosses over the front of the ankle to keep the foot in place as well as a strap that goes over the front of the foot. This is the best option if you are looking for maximum support to keep the feet in position.
X-Small: 2" W X 7" L
Small: 3" W X 9" L
Medium: 3" W X 10" L
Large: 4" W X 11" L
X-Large: 4" W X 15" L