I typically wear a size 10.5 and I ordered the size 10 Presto shoe. It fits perfectly with a little room to spare. The size 11 would have been much too big. The shoe itself is very comfortable with good arch support. However there is not much in the way of lateral support,which is to be expected from a "fly-weight" running shoe. No problem here as these are intended for everyday casual wear. To address the issue of keeping a white pair of shoes clean I applied "Rust Oleum Never Wet(boot and shoe)" to help shed water and repel dirt for easy clean up. It made them shed water surprisingly well for a mesh shoe which should help in keeping them clean for the spring/summer months to come. Overall a great looking shoe with lots of comfort that I would buy again. I don't think these are the best running shoes out there but if you're looking for an all white runner that is comfortable and isn't too expensive these should fit the bill.