The socks were much thinner than I imagined; however, they were indeed warm.  I usually were two pairs of socks to try to keep my feet warm in winter.  Just wearing the one pair of the Military Heavy Wool Thermal Boot socks did keep my feet warm.  The photo was sort of misleading for me.  I have large calves and the socks looked like they work work for my heavy legs; however, they were pretty narrow so I fold them down for comfort.  I wish they had a wide calf version - they would be the perfect five star socks.