Originally Posted by
choddo
If you follow the measurements, it will be snug but correct.
This has been my experience with their shorts. Disclaimer: I'm not rail thin but I'm not large, either (5'10" and 170 lb.). When I decided to purchase them, I read where everyone said to size up since they ran small. Well, it depends on how you define size up. In all other shorts that I have worn, I am a medium based on their size charts. In Castelli, their size chart put me at large which turned out to be the correct size for their shorts. Snug but correct. I guess, technically speaking, that I sized up compared to what I usually get. However, I think some folks believe that it means to use their size chart and then size up which would have been wrong in my case.