I thought I was ordering a size lower, because my hips were measuring at a large and I bought a medium, but I had to return it for a small, because with the medium I had it as tight as it would go and it still wasn't quite enough.  Other than that, it does help with some of my back pain, but I'm not entirely sure how, because it's pretty flexible.  I wouldn't mind a little sturdier boning.  It's difficult to close the velcro and have it lie flat, just due to the length of it.  It does bunch up, so it's probably not the best accessory for in public and I have trouble with it trying to inch its way up.  However, it does give a little more support to your back and abdomen, so I'll keep it and continue to use it.  This one is good for people with long torsos.