Women's Franco Sarto Giselle Wide Calf Knee High Boots Classic comfort. Wide-calf, knee high boots for women with a sleek, understated silhouette that offers endless versatility. Leather/synthetic leather upper. Partially recycled linings with soft + eco-conscious comfort. Side zipper. Square toe. 15.75 inch shaft height, 15.35 inch circumference. Note: Measurements based on size 6 boot. For each half size up from a 6, shaft height increases by . 12 inch, circumference by . 20 inch. 1.75 inch heel.