From Naturalizer, the Rena 2 Leather Tall Boots feature: Leather upper responsibly sourced from Leather Working Group certified tanneries and recycled lining polished straps and buckles Insole, toe box and heel counter crafted from partially recycled materials Side zip closure Contour+ Comfort technology for a premium fit and all-day comfort experience Removable insole Approx. 1" block heel Approx. 14.56" boot height Approx. 14.56" calf circumference Imported. Note: Measurements based on size 6 boot. For each half size larger, shaft height increases by .12 inches, circumference by .20 inches