Very, very comfortable! A tad bit narrow in the front, but not so much that they're uncomfortable. I love the arch support and the cushiony sole. Didn't have to break them in at all; they fit like a glove from the very beginning. Not only is the top strap adjustable, but the ankle strap is also, which is nice since I have narrow ankles. I expected them to be more blue in color, but only the insole (which is covered up by my foot) and the decorative stitching are blue, and the rest is charcoal gray rather than navy blue like I was expecting.