Use the BodyFit® 18-inch foam roller to improve core strength, balance, and flexibility. It's also designed to promote better posture and skeletal alignment.
I use a roller for all kinds of muscle stretches, this is my third (I travel and have a couple of semi-permanent locations where I store my fitness equipment), and this is the only one I have ever used which has lost it's shape, becoming elliptical rather than cylindrical. It's new shape causes more problems than helps. Don't buy.
I used this to roll my IT band in the evenings and after about two or three weeks the center got flattened down by about an inch or two. It now has an hourglass shape to it. The roller still works, but now it's inconvenient to use since it doesn't roll well and it's harder to focus on the right spot because of the curve.
I absolutely love this foam roller. It's not too soft, not too rigid, and it can take some heavy wear before it begins to start losing its shape. This's provided much relief to my quads, hammies, calves, and IT band!