I am generally a size 7 and have had my previous Merrell winter boots in a size 7, and these fit perfectly in a size 7 (with normal socks - they are lined so I dont think you would need to wear super thick socks). (I usually only have a size 8 in walking boots for room for thick socks and once in a pair of trainers which seemed very undersized). The soles are not slippy (as mentioned in another review). The boots are lovely in the Falcon colour, which is like a Kahki green. They are very comfortable and warm, no rubbing at the ankles which I have had with other brand winter boots. Overall, very pleased, nothing negative to say.