I wear an 8 and sometimes an 8.5, luckily I ordered both sizes because the 8 was way too small. My big toe was hanging off the front of the shoe by a good centimeter. But they are SUPER comfy, like walking on a pillow. If you have super narrow feet this show may not be for you because the front strap part is quite wide and you can't adjust that section. I have fairly normal width feet though and they stay on fine.