Got these for my Dad 2 Christmases ago, and he asked for a second pair to live at his second house.  I have been buying Acorn shearling slippers for 14 years now;  I think I'm personally on my 5th pair, and I've given at least 10 other pairs to friends and family as gifts.  They're VERY warm - if you're looking for something to just keep your toes slightly warmer, you'll find these too hot - but if you're looking for cozy cozy cozy, this is it.  The rubber sole allows you to go out to the mailbox, walk the dog (not too far), get the paper, etc.  I'd wear them to work if I could get away with it.