On a very cold day, I wore these Wigwam socks in my Ariat Fatbaby boots for 13+ hours straight! The socks were incredibly A++ comfortable!  And despite keeping my feet warm, they never felt sweaty or hot. The socks were perfect at the end of the day.  My only con I could say is the top was a tiny bit thick as I have a high arch and I could feel it pressing slightly against the top of my boot.  Excellent sock.  The Columbia Falmouth light merino hikers I tried the next day bunched up in my boot on the bottom of my foot in front of my heel and were not as comfortable as the Wigwams.