I did research about these shoes because I had always wanted a pair of full leather hiking boots. I have a wide foot which makes it tough to size, but had a lot of success with the Vasque Wasatch GTZ boots in a 10.5W size. According to vasque.com both the Summit's and the Wasatch are built with the same last but the Summit's were sloppy loose in the identical size. Bummer for me, but I really like the Wasatch so I will have to go without full leather.