These have some support in them (not a lot, but more than another very popular brand I know of). I wear an 8.5 but am sending these back to go up 0.5 size. In these 8.5 size, my toes came right to the end of the shoe and poked into the upper, which would become uncomfortable over a day with some swelling due to pooling and heat expansion of vessels. I also have one foot just slightly larger than the other and so the fabric area over the top of the arch of the foot was too tight on that foot as well as difficult to slide the foot into the shoe to get the heel fabric up over the heel. If, in your regular-shoes shoe-size you always have a little room then your normal shoe size will be fine in this shoe. If you *occasionally* find in your normal shoe size, in regular street shoes, having to go up a half size for comfort, then I recommend doing that up front if ordering these shoes.