I wear mine without socks, on advice of shoe store. They are amazingly warm even in deep snow. Unfortunately there is no size on them that I can find. (I love mine.) Here’s a tip from an ebay seller.
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“For example:
~If you wear a half size get the smaller size. Which means if you wear a 8.5 be sure to purchase a size 8.~
I’ve found that, after buying a pair of Uggs, they’re almost a whole size too big. I wear a shoe size that can range from 7.5–9. As most women know, it depends on what kind of shoe it is, what socks you’re going to wear if any, and if your feet tend to swell or not.
I purchased a size 8 Ugg boot because I figured I’d wear socks with the boots. But found out that even with a thick sweat sock a size 8 boot was too big for my foot. So instead of buying an 8, I need to purchase a size 7.”