These pants are made with the same PrimaLoft insulation that the Whiteout jacket is made with. This is a similar insulation to down with the same warming capabilities, just without the added bulk. These make a great hunting pant when worn over a few other layers of clothing, and will keep you warm for the whole hunt.
A feature I really liked about these pants were the full length zippers running down both sides, allowing for them to come off easily and go on easily over boots.
The only bad thing I can say about these pants is the price tag. If they are in your price range I would definitely recommend them, you won't be disappointed!