I wear between a 7.5-8 and the 7/8 fit perfectly. I do have an arch and these conform to my feet. They're very comfortable to wear too. I've worn these while watering plants and just around the house. If they get dirty, I just rinse them off and let them dry. These will definitely come in handy when going to water parks as well. Even when they do get wet, no slipping and sliding. I ordered the green and they're a pale light green.