The REX knee boots feature a Chelsea-style stretch gore at the side for a defined fit and comfortable movement. A chunky platform lug sole gives this style a substantial foundation and a boosted silhouette. Lug sole platform Chelsea knee boot Side zipper closure Stretch gore on exterior side Wide treaded platform sole 2.25 inch heel height 1.5 inch platform Size 6 measurements: 13.25 inch shaft circumference, 14 inch shaft height Size 8 measurements: 15 inch shaft circumference, 14 inch shaft height Size 10 measurements: 16 inch shaft circumference, 14.5 inch shaft height Leather and textile upper material Textile and synthetic lining Synthetic sock Synthetic sole