Make sure you really, really want the Narrow. I had one I tried to break in for several months but finally had to give up when it became obvious that my discomfort was well beyond "normal" and I was risking serious deep tissue damage. I broke down and installed a regular B 17 and it was fine. Just a little saddle sore over the first 100-200 miles and now it's great and getting better all the time! Good luck.