I have been wearing Keens for years, but always the fabric strap/rubber sole kind. When I saw that Keens now come in this leather design, I was psyched. I actually had on my previous Keens while I was making the online order, so I checked the size and ordered that size (9). For context: I wear a 9 in almost all footwear, besides a few athletic shoes (Puma and Nike), in which I wear a 9.5. When these Keens arrived, I loved their look, but my heel hung off the back considerably, and I couldn't make them work at all. I also felt like even with wiggling my toes and tightening the straps of the shoe, I couldn't get my toes to a place where they stayed toward the front of the shoe as I walked (and therefore contributing to my heel hanging so far off the back). I was confused, but figured this style just ran small, and exchanged them for the 9.5. When the 9.5 arrived, my heel hung off the back of the shoe maybe slightly less, but still too much that it affected the comfort and aesthetic of my foot in the shoe (with every step I took, I could not only see but also feel that something was off and my heel was too far back). I put in an exchange for the 10 (even though I have never worn a size 10 in any shoe, ever), but I think the problem might be the shoe. Unlike the previous Keens that I have owned (the Whisper Sandal in fabric), the heel bed of this shoe is totally flat, rather than with a slight curve upwards at the back of the heel. That slight curve in the Keens I currently wear seems to function to keep my toes toward the front of the shoe and, overall, keep my foot in the right place. I think the problem with these Keens is that the heel bed is completely flat, with no curve at the back, so there is nothing to keep my toes toward the front of the shoe. I think the problem with the 10s will be that there is way too much space between my toes and the front of the shoe, but I'm still willing to give them a try -- I really like the way Keens look in leather!