I have the Pronghorns and a few other non-insulated Danners.
To keep my feet warm when I stop for awhile I use vapor barrier socks. You wear it between your liner and wool socks, keeps the feet toasty. You hike with them on, but you would need to change your socks two or three times a day, depending on how much your feet sweat.
So I just put them on when I am going to being glassing or sitting in one place for a few hours.
They sell them at REI or mountaineering stores.
