You get both. 14 inches pit to pit before stretch 25 inches long Fits kids 100-150 lbs Arm flaps on 1 side for high braces for thoracic/cervical curves Reversible, like all scoliosis brace shirts These do have side seams. Very smooth, silky spandex with firm stretch. Not as stretchy as the tubular knit kind of scoop neck brace shirt. I think 1 was worn once and the other, never worn. My daughter ended up having spinal fusion. Nonsmoking home with cats.