My husband always wears a size 9m, he never changes, when these shoes came in 9m he couldn't even put them on, they were so tight, surprisingly we checked the size on the box and in the shoes. We sent it back and will not recommend it
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Pros
Bought my normal size and it fits very snug/tight
Cons
My latest 10m Calvin Klein shoes are slightly larger than expected and fit better than the 10m moccasins in that size.