Stylish, luxurious, and flattering, the Ariat Midtown Knee High Boot is a worthy addition to your footwear collection. For maximum wear resistance and flexibility, it is equipped with the Duratread outsole. Full-length back zipper Duratread outsole. Please refer to the size chart for proper calf sizing. Sit in a straight chair with your knees bent at 90 degrees to the floor with socks you'll most likely wear with these boots. Measure calf width at the widest part, and calf height from the floor