Our Leather Locking Leg Restraints are one size fits all. They are 15" X 3" and provide circumferences between 8.5" and 13.5". Push the D ring through the appropriate sized slot, feed the 11" leather strap through the D ring to prevent the lock from being pulled through the size slot and lock it up with a padlock. Leather Locking Leg Restraints are constructed from out long lasting LeatherWerks quality leather.