My office gets very chilly from the air conditioning in our building, so if my feet get cold, I take these lamb slippers out of my armoir, shut the door, and get back to work. They warm up my feet rather nicely, and they are so comfortable, often times, I don't want to take them off. Of course,  I never leave the office with them on  but, it is my dirty little secret at work, and boy, I sure love them!