US 5.5, 6 & 10 - Expected to ship 2 weeks after the order is placed Sienna is a 3-inch block heel sandal with double ankle straps for stability and our signature 12-hour comfort insole. The open toe is wrapped in elegant silk, tied in a soft knotted bow for understated sophistication. Perfect for brides and modern romantics alike, these knotted block heel sandals balance grace, comfort, and timeless style.