I also tried a C 17 and thought they were superb . . . Until 20 miles, when like many of you my behind and the saddle disagreed. A B-17 also does not fit me well, but the Pro saddle is very comfortable. My conclusion is that for my posture on a bike, I need a narrower saddle. I suspect the C 15 would be a better choice for me.

In short, it may not be the saddle material that is causing the problem. Lots of variables out there in choosing the best saddle for the job!