What Our Gearhead(R) Experts Are Saying:"I always bring this cotton liner when I'm backpacking or staying in hostels. It's super soft against the skin and keeps my bag cleaner on extended trips. I've also used it on its own for warm summer nights under the stars-it packs down small and is surprisingly versatile."We love how the Cotton Sleeping Bag Liner adds just the right amount of softness and warmth to our sleep system without weighing us down. Whether we're heading out for a weeklong trek or crashing at a trailhead campsite, this liner keeps our sleeping bag cleaner and gives us that clean-sheet feel no matter where we are. Crafted by Polartec(R) from recycled fleece, the liner is naturally soft and gentle against the skin, without chemical treatments. It's breathable, lightweight, and packs down small-ideal for everything from international travel to spontaneous overnight bivvies. With its reversible design and easy cinch-hood closure, it works seamlessly with a variety of sleeping bags, or even as a standalone sleep layer when temps are mild.