I got these boots in anticipation of my upcoming annual winter fishing trip, where the nominal seacoast temperature is 30-deg.F with a constant 30MPH wind (so it feels colder).  We go out all day in that weather.  Over the years, I have been swapping out pieces of my kit as I learn what works in that setting and what does not.  I used several other makes and models of boots, and they held up well for the first two hours or so.  By the end of the first day, I was moving around a lot more, including doing leg squats, just to (try to) stay warm.  Also by the end of the first day, the metal fittings on most of the clothing begin to rust.  I have learned my lesson.  I am a size 11.5, so I went with size 12 to accommodate for thick wool socks.  I will be better prepared with these boots, no doubt.  Their construction quality is great.  My family members who are hunters and are familiar with LaCrosse (and specifically this model of boot) have had all good experiences with them.  I will, too.