I wear a size 10 in the nike free runs and a 10-10.5 in a normal street shoe depending on the brand. I ordered a 10.5 in these and they are at the point where they are a bit snug but if I go up a half size larger they might be too big. With no socks or a very thing sock they are perfect but with a heavy nike dri sock they felt a bit snug around where the toe strap part is. Overall after just walking around in them for a couple minutes around the house they feel great. I'm using them in the tough mudder in september in WI so we will see how well they do.