Wow. Really comfortable material.***FOLLOW THE SIZE CHART, go size UP when in doubt!! I'm 5'5" tall, currently weigh 145lbs (120 before baby for body size reference) I have a 34" under bust, and at 25 weeks pregnant, I have a 44" belly circumference. I got the large, since I have quite a bit more growing to do, but it still fits snug at its tightest velcro setting! Super sleek under a regular dark t-shirt. Shipped to me same day, and it has immediately helped my lower abdomen muscular pain, and I'm not gonna lie, it feels like my super inflamed sciatica is taking a chill pill, too! MIND YOU: there is still pain. Pregnancy's gonna Pregnancy if you know what I mean. You can't mitigate all discomfort. But YES this helps. It's comfy, feels nicely made, and shipped to me FAST. not sure what more out of a product one can hope for.