My feet get cold while sitting.  Even with these, that is still true.  On the other hand, while active, these boots will keep your feet comfortable.  They're not really a great boot for everyday walking around, kind of big and clunky, wouldn't want to have to travel far.  My size 15's were a bit snug, at first, because the super thick liners hadn't broken in yet.  The liners could be used a base camp booties, they're so thick.  Stick with your normal shoe size, they'll break in easy. I bought these as a low cost solution for winter time motorcycle and eBike foot wear, haven't verified usefulness for that yet..  The velcro closure/adjustment across the top of the foot, is a bit long, not a lot of engagement when tightened all the way.  Super easy to slip in and out of.  Because of that, I like them better than my house shoes and use them in that capacity all the time, really!  Snow and mud?  I'll find out one day, meantime, I like them for just kicking around the house, garage and back lot, during the winter months.