I would be tempted to go a size up since they're winter boots. They have fleece inside and that way you'll be able to wear more than one pair of socks if the weather warrants it.
But, I wear a 8.5 and when I picked these up at the tent sale they only had 1 pair of brown boots left in an 8 - tried them on, they fit, so that's what I bought.
It's tough since manufacturerers having their own sizing sometimes... if you get them and they're too big/too small you could always send them back and have dover send you out the right ones. | 
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