Penfield Jackets - Penfield Hoosac Mountain Jacket - Navy :: Women > Jackets. Insulation; 550 Fill power premium down: 80% Polyester. 20% CottonWomen's Penfield jacketShell; 80% Polyester. 20% CottonRib knit inner cuff to seal out the coldTeflon coated fabricInside 2-way Delrin zipperButton down storm flap with easy-to-grip rubberized buttonsDurable. breathable and water resistant Size: one size,10.