My first pair was a Sky Speed2. I loved it so much I tried to get another pair and found out they were not making the SkySpeed line anymore (at least not in the US as I saw a SkySpeed3 in the UK). So I scavenged for a SkySpeed1 and found this shoe. It fit and operated the same as the SkySpeed2. Lightweight running shoe, I train on mostly non-concrete, and have run a half marathon on concrete in these with no issues. This shoe is not as cushioned as some of the other super-super-gel shoes, but I like how light weight it is and how easy my feel glide when I run in them. My foot runs a little wide but not enough to go with wide width, and I underpronate by nature. This shoe fit well.