Women's knee high boot with BZEES Air Step Technology: Designed so you’ll feel weightless, energized and free Ultra Lightweight: Step lightly with a nearly weightless feel. Machine Washable: Wash on cold and air dry and Odor Control technology Dynamic Stretch Fabrics: Move freely in shoes with built-in stretch FreeFoam Comfort: Low pressure insoles with maximum foot contact and cushy arch support 14 3/4 inch boot height, 14 1/3 inch calf circumference. Note: Measurements based on size 6 boot. For each half size larger, shaft height increases by .12 in, circumference by .20 in. 2 3/8 inch block heel