The Ascend 2-in-1 shorts were not my first choice for running shorts, but the compression fit internal brief is a life-saver on longer runs. I love to run "longer runs" (I go for time not distance, but usually run 2-2.5 hours) but definitely do not have skinny runner legs. Inner-thigh chafing has been a constant bane on my summer running pursuits and the internal brief is definitely the answer to my problem! I usually order a small in Marmot, but went up to a medium this time. While they are a little loose, the drawstring keeps everything under control and they are incredibly comfortable.