I bought a 1/2 size bigger than usual because I read the reviews saying that the shoes ran small.  Well, they didn't really run small in the standard way but they were SO narrow across the instep -- I was really surprised considering that is the narrowest part of one's foot. The shoe was roomy in the toe box and was even a little big in length but I had to return them - and might have exchanged them for a wide but they were sold out.  I was disappointed because I've been wearing Clark's for years and this is the first time I've ever had a problem with the width.  I don't think I'll feel comfortable ordering them online anymore :(