I ordered a size up to have room for socks. Glad I did. Although I still couldn't wear thick socks with these boots, I haven't needed to. By far the best snow boots Ive ever owned! My feet never get cold even with very thin socks. Good grip on the bottom. Extremely comfortable. I can wear them for hours and my feet never hurt. I will be buying another pair for when these wear out. Theyre that good!