I love this ring.  I ordered a 4mm  too so I could wear which ever one I felt like.  I ordered down 1/2 size on the 4mm and ordered my regular size in the 8mm and they fir perfect.  I guess if my fingers swell up too much in the summer these are so reasonably priced and can size up but they seem to fit nicely  without being too tight.
Even this wide band feels so comfortable with the comfort fit and it looks so nice.  Looks much more like an expensive ring.  Very happy with this puchase and the rings arrived a couple of days earilier than expected