Thank you for your cooperation. Your comment always is my sustained encourage to move on.<br />The heel belt color is at random， maybe not same as photo shown.<br />Size reference:length(cm)<br />Size 18(US:3):12cm<br />Size 19(US: 3.5): 12.5cm<br />Size 20(US: 4.5):13cm<br />Size 21(US:5.5): 13.5cm<br />Size 23(US:7): 15cm<br />Size 26(US:8): 17cm<br />Size 27(US:8.5): 17.5cm<br />Size 28(US:10): 18.5cm<br />Size 29(US:11): 19cm