These are the perfect socks.  I bought them to sleep in because normal socks end up waking me up after an hour with hot sweaty feet and without socks my feet are so cold in the winter it take me at least 30 minutes to get them warmed up enough to fall asleep.  These keep your feet the perfect temperature and actually help me to sleep more soundly and I go to sleep very fast.  I just bought a 2nd pack because I plan to wear these in the summer with sneakers.