I took the advise I read from others and got a half-size larger than normal; I wear 9.5 in Merrell's and got a 10 in this shoe.  Very satisfied with the shoe.  It is lightweight yet still has a solid foot bed.  The styling is great and I like the way I can tie once and then use them as a slip-on.  I bought another pair in blue and was very satisfied with the consistency of the product.