As much as I'd like to be able to provide you with my sizing in G&G or EG but I've yet to kop a pair :)
I usually size down a bit in AE and Carmina from a 10.5 to a 10, it really depends on the last.
For boots I always size down a half size and I did the same with this pair which fit a bit larger. They still fit nicely with a thick pair of socks in a 10.
I highly recommend them as worry-free winter option, you'll never get cold or wet.