Depends on the model of PI shorts you got. The more expensive ones have less bulky chamois and are pretty comfortable on longer rides. My favorite shorts are the LG ones that TE carries---the ones that are very very expensive. One pair is a great investment, if you are planning on doing any really long rides. I also like Terry's new flex chamois, the Sheebest chamois, and Exte Ondo's Raicor chamois.