These shorts are very well made and the Chamois and seamless leg grippers are excellent. I tested them out on a 24 mile bike ride followed by a 6 mile run. The shorts fit well everywhere except at the waist, which ended up hurting my stomach as I was running. It was very tight and the material is doubled up around the waist. I usually wear and XS and I sized up to a small for these. The high tight waist also caused my matching tri top to ride up as I ran, I found myself constantly pulling it down. Sadly, they are worn so not returnable. In the future I will try the one piece tri suit instead. For reference I'm 5'3" and 115# 26.5" waist.