Purchased these boots to walk in the mud/slush during spring and early fall, but discovered that they are the best winter walking boots I have ever owned.  I wear them with a pair of wool walking socks and my feet have never been cold.  I walk approximately 2 miles daily on trails through the woods in Northern Wisconsin.  Yesterday's walk was 15 degrees and we have 2 feet of snow.  These boots have good footing with no slipping and are very light on my feet.  I think the "croc material" insulate my feet.  I have never worn them as winter boots where I would just be standing and watching an outdoor activity so I don't know if they would keep feet warm then. I normally wear a size eight croc, but ordered a nine knowing I would be wearing a wool sock and they fit perfectly.