Bass Pro had these on a good sale last week and I was looking at them anyway to trial as another winter boot and 100% waterproof boot for extreme rain/storms. I started looking at these (another rubber boot) after realizing how warm my simple cheap duck (rubber) boots were when worn during our 2 day TOC that had temps near freezing. This Muck boot is one of the most comfortable, highly padded/insulated boots I've ever tried. Since they don't tie and are flexible at the top, pants easily fit inside -no bunching like with tied boots. Of course, this also makes them easy to slip on and off. They are rated for -40 but ill provide feedback on the warmth after testing them while fishing this December.