Highlander Envelope Sleeping Bag LinerThe Highlander Envelope Sleeping Bag Liner is a spacious liner that will add an extra layer of warmth to your sleeping bag. The liner will protect the sleeping bag's internal fabric, meaning that it requires less washing and is less likely to get damaged. Packing down into a compact stuff sack the liner is so lightweight it will take up very little weight or room in your pack. Made from a soft to the touch, skin friendly polyester material the liner