I wear 10-2E size in New Balance shoes (M2040 and 1340), but a 10-W Stabil CS3 is too small for me. The 3rd to 5th toes of my right foot feel constricted and a 2 miles walk makes it uncomfortable.<br />My father wears 9.5-2E in New Balance shoes and he feels good with these pair of 10-W Stabil CS3. So I think 10.5-W may fit me.