I wear the Booster in a 42.5, Anasazi Verde in a 9.5, and typically an 11 street shoe. This sizing is tight, meaning there is no dead space, and I only wear them bouldering once I have warmed up and am going for it.
I have tried the Feroce's in the same size, and I found them to be equally snug, but a little bit more comfortable because they are not as downturned. I can't speak to the vapor personally. I hope that helps.
I wear a 10.5 street shoe, and wear a 41.5 in the Vapor V's. Tried them on in the store and they fit pretty well. Ended up being slightly painful for a week or so of breaking them in. They haven't stretched too much and thus are a pretty tight fit (although they are much more comfortable now). I actually really like the fit once you get through the original break in time.
For comparison, I previously had a pair of 41.5 LS Nagos which stretched significantly and are now much looser (make the farting sound when I step in them).
11.5 running shoe, 42 in Scarpa Feroce's. I'd prefer a 42.5 maybe even a 43 though. They are quite painful and do not stretch. I can stand on invisible edges though.
For street shoes, I wear US size 7/7.5. I got the Vapor V in size 38.5. Hurt a bit to break them in but now there are comfy and still high performance after 3 months of regular use. Good luck.
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