My opinion [SEP] It didn't work out so well for me. Though that does not necessarily mean the product will not work out for others. If you never wore one before, you would think you would just hook it on like a backpack which you kind of do anyway. It also includeds a useless piece of paper with instructions on how to put it together except they leave out the most important part. Amazon also has a video on how to put it together from the manufacturer which is also useless because the most important part that you need to know, is only a frame or two as if they knew it was going to be difficult to put together and didn't want the viewers to see it. I tried it on over my bareback without any undergarment shirts. I also tried it on over a t-shirt. In both cases there was absolutely no signs of correction on my curvature spine. The "Y" shape piece in the back, rode all the way up to my neck instead of staying in the area of the curvature. As far as being comfortable, it was okay. You just felt the strap coming out from underneath your armpits and over to your shoulder to be velcroed onto the strap. You would feel the pressure of the strap against your skin or over your T-shirt/undergarment top but that's all it was. The pressure gives you the illusion as if your back is being straightened out. But in reality, it didn't do not one bit of correction. Not even a little. Maybe for my particular curvature, my particular curvature may be beyond repair/correction. I may end up returning it.