My don't have the seams outside (I can post pictures, if need be), unlike the other shorts I have: Pearl Izumi, Louis Garneau and Sugoi. Do you mean inside seams? I've managed to make the fabric in the Sugoi shorts (RSE) pile in the thigh area, as well as the Pearl Izumi; the Garneau I don't use enough because they are too long. No issues thus far with the Assos, although it might be too early to know. However, I have had their knickers for 3 years and those have not piled.