I've been wearing Ecco shoes for a few years and I'm very happy with the size. Unfortunately I just bought the men's Irving Slip-On Loafers and found them extremely uncomfortable. After wearing them for a few hours I found them to be very snug on the top of the foot and on the sides. After 4 hours in these shoes I couldn't wear them anymore. I have worn many other types of Ecco shoes in the past and have found these to be the best shoes on the market. Something is wrong with the design of the Irving slippers. I hope I can get a refund and then find a better pair of Ecco slippers.