Comments about Mens 2XU Perform Tri 9 Fitted Shorts:
My son and I each bought a pair of the shorts for our first sprint triathlon. I have a 34 waist and average build, and a Large fit me perfectly. My son has a 32 waist and is generally thinner. For him a medium was the best fit.
So far we are both very pleased with the shorts. They dry quickly, are great for cycling, and are thin enough to be able to run comfortably.