anyone with a bad back that is out of place needs to sleep on this…it will save you a trip to the chiropractor and in a couple of days give you pain free relief!!! not exactly what it was made for, but it works by putting continuous pressure on the spine…no house should be without a couple of these things!!! if i have a high between the shoulder blades, I sometimes stack them end to end and sleep on top of two of them to cover my whole spine…and after a couple nights, you will unconsciously stay in the middle of the things too…great for keeping the spine aligned if you sleep on your side too… I cannot say enough good about these things. Only wish more people with back pain knew they existed!!! ..More