Perfect sizing unbelievably comfortable shoe. Bought the black and it goes with navy and black so v useful. A major quality control issue though, the right insert (which you do need although it is removable) had a huge defect in my first pair, rendering them unwearable. Alex is customer services was v helpful though, and it was no problem getting a replacement. However the second pair had the same defect although much more minor and I decided to live with it as I liked the shoe so much, but do check yours! Basically there is a strong crease across the insert under your toes, and in my first pair it was so severe that it caused a lump under your toes which was too uncomfortable. I've still given them 5 stars though, as they feel like slippers.