Good Grief...I have all PI ultra sensor shorts 'cause they felt so good. One in size large from last fall when I first began this experiment with biking and 3 pr mediums that I just bought at the beginning of this season. I seem to have the opposite problem from some of you...no change in waist(still big!)but my thighs are shrinking. I ride a fair amount about 3000 so far this year. I wonder if my thighs will start to enlarge eventually. I use gearing to keep spinning rather than muscle thru my rides. I'm gonna tackle shorts issue with my sewing machine just to see if I can tighten up the leg opening.