I purchased these for my girlfriend after finding that brick and mortar stores sold these for $20-$30 more.

My SO absolutely loves these.  She claims they are very comfortable and are extremely warm when she wears them.  She ordinary wear a 7 but found that the 7 was a little snug so she got a 7.5 and it fit perfect.  Because these come in half sizes, I would recommend a half size larger of your normal shoe size (you will likely be wearing thick winter socks).

Lastly, the waterproofing is superb.  Trudging through Chicago snow and rain and her feet have stayed completely dry!!  Highly recommend.