I wear ONLY Z COILS. Z Coils remove ALL shock from your spine, and you don't realize how much shock is there till you take your zcoils off.
www.zcoil.com
Yes, they aren't very pretty, but the sneakers and clogs can be worn with long pants. Plus, they last forever since you just change out the springs for $35, less on Ebay. They screw on and off.
You have to be fitted at a special ZCOIL store but then can buy them on EBAY once you know your size and weight of the spring needed.
You should stop by a store if there is one in your area and try them on. You won't believe it. If I had these 10 years ago, my back wouldn't be in this condition today.