Works as advertised for me
When I first took this out of the box, I was livid. It seems like nothing more than a cheap slice of styrofoam worth maybe a nickel.  I was tempted to return it with an angry note, but I am desperate for back pain relief, so I positioned it between the mattress and box springs under my sacroiliac as instructed. For the first night in weeks, I slept like a baby,  pain-free for eight hours straight. I woke up feeling wonderful.<br />  Maybe you can get the same results by cutting a piece out of one of those disposable styrofoam coolers -- or maybe not. I don't know. What I DO know, is that this product works as advertised, snd deserves 5 stars and two thumbs up.
Rating: 5 stars