I don't know how true to size they are. I generally wear a 43/10 in any shoe, but GATs in 43 are a bit too snug. I can only fit in them with thin socks and no laces. All of mine are subsequently 44s. I'd say they fit a size bigger than CP size, but if you're a half size, go to the next (whole) size up (if you're a 43.5, try a 44 and see if that is a perfect fit. I have an inkling it might be). A half size bigger might be all they need.