My husband's only getting 2 pairs of these, and I'm claiming the other two! After several hours, my socks will normally get very damp (causing my feet to FREEZE inside my shoes!)  But my feet were still toasty warm several hours after I put on these socks, indicating that my feet were still dry! I found this a bit hard to believe, so OFF came the shoes (and the socks!) so I could check this myself!  Dry!  DRY, DRY DRY!!!!  Excellent purchase!  Yay for me!!