Pongee Is A Very Soft, Silk Like Polyester Fabric That Packs Down Quite Well. Add Additional Warmth To Your Existing Sleeping Bag. Use Alone, Or Use It To Keep Your Bag Clean. Stuff Sack Included.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }