Hey

Just sharing my recent experience. Hope it helps a bit.I am 8.5 D in Redwing IR and ordered a pair or Mr Lou in 8.5 D. They were really snug, I wear them inside with a thin plastic bag instead of socks. My feet were almost dumb after a few minutes of wearing them. I retuned them and took a 8.5 E instead. That is much better…I am in the process of breaking in.

This having been said. I believe I could have managed to breack in the 8.5 D but with much unncesary pain.