The ROCKY knee boot features the wide profile of an engineer boot with harness and buckle hardware adding an industrial edge and giving the design an adjustable fit. Block heel engineer boot Slip-on style Top gore with 4 adjustable buckle straps 2 inch heel height Size 6 measurements: 14.5 inch shaft circumference, 12.5 inch shaft height Size 8 measurements: 15 inch shaft circumference, 13 inch shaft height Size 10 measurements: 16 inch shaft circumference, 13.5 inch shaft height Leather upper material Textile and synthetic lining Synthetic sock Synthetic sole