This would work well for someone who doesn't need rigid support, as it's fairly flexible. Personally, I need more support than it really offers, but it may work well for others who just want a mild posture assist. If you're like me and are looking for an extremely rigid brace, this is not for you. It's also not as long as the product images lead you to believe. I'm 5'7" and it stops at my hip bones, which may be good for others, but limits how helpful it is for me, personally. When it comes to sizing, grab a tape measure and measure your waist at the narrowest, and the size chart will be helpful. I have a 35 inch waist, and the Medium was the correct size. I wish the straps were made of stronger, more rigid materials, as they bunch up easily and can be a bit painful in the shoulders when that happens. I also wish the boning went all the way around instead of only having four bones in the back. The lack of structure in the straps and the front limits the stability it offers, but for someone moving a lot while wearing it, that may be just what you need.