Bought for work but in HVAC you're always outside. Most of the time they keep my feet wonderfully warm, so much so that I don't even have to put them on until the temperature drops below 20 degrees. I don't have insulated boots (boots don't breathe at all) but they still make my feet sweat when it's not that cold. I recently wore them during a polar vortex with a -26 degree cold wind on the roof and my feet were numb/burned after 1.5 hours outdoors with a 15 minute break inside (3 hours total). Not recommended for extreme temperatures, but - 10 to 20 degrees is perfect for the money. I wore my Carhartt thick wool socks on another roof in -26 degrees and they held up much better, FYI.
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