PRICES MAY VARY. Extra Wide Calf Circumference (IN) 17.7 Calf circumference increases by 1.18 (IN) from regular to wide and wide to extra-wide Measurements based on size 6, standard calf; for each half size larger, calf circumference increases by 0.26 (IN) Heel Height (IN) 3.6 Nylon Zipper Closure Block Heel