I wear these in Afghanistan and I am moderately pleased with them.  They keep my feet warm as long as I am moving so they do the trick even in -15 degree weather. One set back is that the seam at th etop of the sock came undone the second time I wore them, but thats cosmetic and not a funtional problem so far.  If you are using these for hunting, sitting in a stand ,they might not do the trick in colder areas, but if you are moving around through the woods or simply out in the elements for work they are good as long as you keep moving.