I have a long (11), narrow-to-medium foot with a good arch. Almost all NB shoes have a straight last, so with my good arch (from years of martial arts) and toes-in-front walking pattern, they always seem to be my shoe of choice. These 645's (grey suede) are no exception. The 11D's provide excellent arch support without having to lace the sides up until they touch. In comparison to the 644 walking shoes, the toe box is slightly narrower, but not a problem--my toes don't feel cramped. My heel is snug with no side slippage at all. Maybe because the shoes are as close fitting as they are, they did require a few days of breaking in around the house, but within a few hours of casual wear, they were ready for all-day use. And after being in them all day, the mesh allowed excellent breathability, thus no sweaty feet or damp sox. Additionally, the tread pattern provides positive adhesion on any surface. All in all, a sturdy, good-looking casual shoe. I even had a lady at the check-out line at the market remark, "Nice shoes!" I couldn't agree more.