Barb - yes, that's the one. Not only can it work on your i-band, but it's also good on the hammys and calves, too. I don't know if you'll need the 36", unless you plan on cutting it down and getting two out of it. Mine was cut down from a larger roller and it's only about 18" long, as I only use it for one leg at a time. I know some people use it lengthwise down their back, but I never got much out of that position.