I was looking for a shoe to wear in colder months instead of my Merrell Arc 2's, so I tried the Siren Sport but they didn't fit my foot. I saw this Azura and immediately knew it was meant for me. It fits like a glove and feels like I'm walking on a cloud --- right out of the box. They feel just a tad bit wide through my arch, but fit well in my narrow heel, so a good fit overall. Length is perfect for my size 10 feet. I got the Castle Rock and it rocks! I did not get the waterproof version because the description says these are waterproof. Thanks, Merrell, for another great shoe.