There is something about the material Boa uses. I know most running shorts are about the same. A couple weeks make us prefer one brand or model. But there is something. Intangible about this particular model even more than what I love about the other 4-5 pairs I have that I love even more. All my Boa shorts I love more than my other athletic branded shorts. It is the comfort; the ability to pick up speed without restriction, that I like the most.