Sure you have. Introducing Thermosack 's Big 3 Warming System . The secret of staying warm longer is to cut the wind, repel the moisture, and retain your own body heat. Thermosack does just that with the Big 3 Warming System.
Inner liner is made from a windproof nylon.
Insulation is a full 9 oz. To complete the total design, we also added a storm flap that snaps over the zipper and extends from the neckline to the bottom.