From the moment I put these shoes on I was conflicted. On the one hand, they feel very light and breathable, and they SHOULD be comfortable. But at the same time, something is wrong with them in practice. The heel is very thick, to the point where my feet always push forward at a slight angle. When running, I always have the feeling that I'm about to slip out of my shoes, even if the size is right. After two years of barely using this shoe on my shoe rack, today I threw it in the trash. They just never felt right.