I have had back surgery about 8 yrs ago. Every since, I live in pain every day! I have 2 pairs of Z-coil that I love and provide me with relief.  I also sit on a medical foam donut all day to relief spinal pressure and that helps too. BUT, I was willing to try these Spira clogs a try since my friend recommended them and they are 1/3 of what I pay for my Z-coils! Well, you get what you pay for. These Spira clogs are JUNK! First off, they are not true to size. I orderd 1/2 size too large for me so I could wear chunky winter socky. HA! I can't wear any socks with these because they are so narrow and tight. Second, they have zero energy return. You can't feel the "bouce back" feeling that you can with the Z-Coils. I have had these shoes for 1 day and they are going back tomorrow. Do your feet, your back and your piece of mind a favor and do NOT buy these shoes. Go get some Z-COils and your back will thank you!