I bought these shoes to have the benefits of the negative heel technology while wearing shoes fit for the heat of summer. My first choice was the Exer-Trek because I was looking to replace my Keens, but found a 9 too small and a 9.5 too large. The Exer-Strap model fits well in a size 10 (even sizes only). They are very comfortable. My only complaint is I wish they had some kind of lining/covering on the insole as what they do have makes my feet sweat some. However, that characteristic isn't enough to put me off these shoes--they are comfortable and cool. I have the Almond Grained K-Calf. They're not very dressy, but they look good with jeans and shorts, and I can wear them with a long broomstick skirt without feeling "under-dressed". Of course, the great Earth negative heel technology leaves my back feeling great even after a day of standing, walking, or working. The velcro closures make it easy to get in and out of the shoes with more choices of "snuggness" than buckles provide.