Cocoon Expedition Liner
Here's what other sites are saying:
At 10,000 feet, it starts to get much, much colder at night. Slip the Cocoon Expedition Liner inside your down expedition bag and stay warmer at night. Cocoon engineers added a cinch-style hood to protect your head, a boxed foot-end to allow room for down booties, and hang loops to secure your kit. Whether you're through-hiking the AT or charging up a Chilean ascent, this lightweight silk liner brings the heat without weighing you down.