The Silk-Cotton Blend Travel sleeping bag liner is a practical option that uses two natural fibers blended together for premium comfort and performance. This machine-washable sleeping bag liner is perfect for keeping your sleeping bag clean, plus it's also a great solution when you're not sure about your hostel sheets. What's more it's lightweight, compact and super soft on your skin, and it's packaged in a handy zippered pouch.Sea to Summit Silk/Cotton Travel Liner Long (Rectangle) Features: Soft, natural fibers, with a less shiny finish than pure silk Double-folded and reinforced seams for strength. Lightweight and super compact. Increases the life of a sleeping bag by keeping it clean, plus adds a few degrees of thermal performance. Machine washable and colorfast. Always air dry a liner that contains silk. Packs into it's own storage case.