I own the Keen Newport sandal and love how they fit. So I thought I'd try these for something a little lighter and easier to put on for knocking around. I was concerned that although I usually wear a 9 1/2 or 10, I had to have the Newport in 11 and was afraid that a 10 in the St Bart's would be too small. Turns out it was too big! I returned them and got a 9 1/2 and they fit perfectly. They are so comfortable to wear and the arch support is perfect. The sole is not as dense as the Newport, so these are not nearly as heavy. A great sandal for just slipping into!