The Foot Sandals are available in three sizes to accommodate different sizes of feet. They are constructed from a durable ABS plastic formed into a supportive foot shape. Each Foot Sandal has two webbing cross-over straps to hold the foot firmly in place. It is possible to add a pulley system which connects to the front of the Foot Sandals. The function of this system is to prevent the toe of the rider pointing downwards towards the ground when pushing on the pedals.