BAI STEP UP Women's Knee High Gladiator Sandals Summer Boots Leather Synthetic sole ?Faux Leather, Synthetic Shaft measures approximately 15.6 from arch Measurement (tested sz 6; approx.): Heel 0.39 inches Shaft (w/heel) 16 inches Opening 11.45 inches Closure: Zipper / lace up Fit: True to size Sole / Padding: Synthetic non-skid sole / cushioned foot bed with padded insole