"...as the old fashioned UK system RMW uses only introduces increases in lengths when you go up a whole size (half sizes just run a width wider)... I left these options out as it just gets way too complicated" This piece of information would have saved me ~$300 after I threw away my size 11s which were just a little too short and ordered 11.5s thinking they would be a perfect fit but ended up still hurting my toes... I shall never again order a shoe I have not tried on. I have only just discovered it. I notice however that it does not hold true for Edward Green. Then again I have been wondering for a while if they use a US sizing system with the stamped UK size being a conversion of the US size.