This wide calf boot boasts a fashionable equestrian styling and all the comfort features one would expect. The shaft circumference is 18 inches in size 6 and increases 3/8 inch for each increase in foot size. The stretch back panel will allow for addition fitting either up or down and an adjustable buckle at the top of the shaft is just one more fit benefit. The upper is soft calfskin and the interior tricot lining is soft, moisture absorbing and adds to the comfort. Material: Calfskin.