An extra layer of comfort for your sleep experience. The Nest™ sleeping bag liners feature high-quality fabrics that increase the cleanliness of your sleeping bag. Choose the liner that’s right for you based on size and your temperature preference. Cozy with plenty of room for stretching, the Nest liners are designed with sleeping bag attachments for a secure fit. Stop washing your sleeping bag, simply wash your Nest liner for a fresh and clean night's rest.