Over half of my work is outdoors, on graveyard shift, and this has been a quite cold winter for me, as I near retirement age.  I don't tolerate ill-fitting, scratchy clothes, so I wouldn't have ordered two additional pairs of these if they didn't do what I bought the first two pairs to remedy.  I'm 6' 4" and my circulation isn't always percolating like it should, so in the winds of early morning winter, I get chilled enough to take risks of getting sick as much as I work indoors, then outdoors, then indoors, then outdoors, etc etc.  These held their shape through several washings, are comfortable, and warm; and yet breathe so they aren't just soggy against my skin after I work hard indoors during my shift.  I'm hoping they last three or four years, but if they don't, I'll look for these if I buy more.