I've always been one of those guys who would put on two pair of the thickest socks in my drawer and my feet always got cold. After a little research and good info from fellow forum members I realized this was pointless. I got a pair of the Arctic Sheild boot insulators from bass pro when they were on sale. I was a little skeptical because they aren't very thick but I figured I would give them a try. Hunted last week in 20-30 degree temps with 10-15 mph N winds. Wore a pair of regular socks, my leather 400g Rockys to the blind and as soon as I got settled in, put on the boot insulators. After about an hour, my toes started getting a little cold, threw a chemical hand warmer in each boot insulator on the tops of my feet and i was super comfortable the rest of the hunt. Well worth the $40 IMO.