HOLLYCHIC + COMPELLING + SLEEK A half zipper closure gives the HOLLY knee boot a calf defining fit with an angled block heel and a square toe giving this style a sharp finish. Vegan leather upper material Square toe block heel knee boot Side half zipper closure Angled block heel Textile lining Vegan leather sock Synthetic sole 2. 75 inch heel height Size 6 measurements: 12 inch shaft circumference, 14. 25 inch shaft height Size 8 measurements: 14. 5 inch