I normally wear 8.5 in running shoes. I think I should be an 8 in Tom's. I kept the 8.5 and put some no-slip inserts for the ball of the foot in them and it works just fine. I am used to them being a little looser now. I like them, but I am not sure how to clean them since I do not wear socks with them. I am afraid of them falling apart in the machine, but hand-washing may not get them good enough. Time will tell.