I lived in Wisconsin when I first found these boots.  They are so warm and comfortable - and I still wear them today.  They look brand new still - never a mark or stain.  When I moved to Birmingham, Alabama, I searched the net for them and bought 2 MORE pairs of them - same style except the tongue on one pair is loose (that is, not sewn to the boot along the sides of the tongue) so you have to hold it when you slide the boot on your foot.  The other pairs have the tongue sown up the sides of the zipper and make it easier to put on without holding the tongue up.  I have back problems so bending to hold the tongue is uncomfortable for me, but it is well worth it when I get the boot on and zipped.  Even in 0 degree weather in Wisconsin my feeet were toasty warm and dry.  Here in Alabama, where it somestimes gets about 10 for a few days at a time, I can still wear the boot all day at work and be very comfortable, never too warm.  I LOVE these boots and am looking to buy a pair or two more just to have them in case they do away with this style.  I did spray them with a waterproofer when I got them - and I would suggest you spray them once a year at the beginning of the season...just to be sure your feet stay dry.  I lived 6 years near Buffalo, NY and these boots are perfect for that weather too - I understand they are made for temps down to -20.