The best fit in a Dansko Professional is to have room. This model is supposed to fit loose all around the foot almost to the point that it feels big. This is a good indication that you have the right size. You want your heal to slip up and down in the back. You do not want your toes touching. Best way to tell is put on a sock that you would normally have on and put on the shoes. You should have around a pinky's width of room in the back of the clog. Short answer is that if it feels tight I would probably get a bigger size. Wear them in your house and see how this feels. The fit on the clog is totally different then any company out. You will get use to the loose feel and they usually become your favorite shoes. Enjoy and I hope they work out for you.