• Face seal: Adjustable to your face. Thermal knit face seal with drawstring closures. • Insulation and materials: Outer shell of strong 420 nylon PAC cloth, coated and treated to repel water. • 12 ounces of pure, U.S. made, Du Pont insulation for warmth. • Lining of nylon Rip Stop material for comfort and durability. Insulated to match your PolarWear jacket's warmth. Exterior shell treated for water repellency. Velcro closure up front, keeps the cold out. Snaps onto all PolarWear, FreezerWear collars.