I have worn size medium Pearl Izumi shorts for years because they fit me well. I have several older pair of this style that fit great. These seem smaller and tighter. Maybe they are just meant to stretch more? I ride about 50-100 miles a week including an occasional metric century. I have many other Pearl Izumi products that I really like.
These are very comfortable shorts. The waist is not binding and does not roll down while in the riding position. The silicone leg grippers hold the legs in place without being overly constricting. The chamois is very comfortable not being too thick nor too thin. The chamois is the women's race 3D. These shorts inseam is supposed to be 8, but appear to be more like 8.5. The Pearl Izumi logo is reflective. The shorts are true to size with nice compression.