I first saw and tried on these sandals at REI but they didn't have the Chocolate color and were more expensive.  I have slightly wide feet (B-C) and find that these sandals fit well -- I usually wear an 8 1/2 and I ordered an 8 1/2.  I like that the straps are thin; they're more elegant than most water-proof sandals.  I wore them all day for a wine-tasting trip in Napa and they didn't loosen up. They are extremely light.  I highly recommend them.