Polyester Is Durable Enough To Last Through Countless Trips, But Unlike Some Other Blends It Feels As Soft Against Your Skin As A Silk Sleeping Bag Liner. 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; }