I work with horses in California and I love these Bogs.  I ordered my normal size 10 and they fit great.  I love that I can work around the barn comfortably and not worry about getting my feet wet washing horses or do anything else in water.  I have worn them now in spring in California and I don't think they are terribly hot so I will continue to wear them into the summer.  I do have a feeling they would not be terrifically warm in very cold weather.  I did but an insole in these boots for more arch support.
I love them for work but they are not the most attractive footwear but for my purpose they are great.