Microfiber Imported Liner for Sleeping Bags: This inner liner used in sleeping bags to extend the service life of your sleep sack. You no longer need to frequently clean your sleeping bag, just clean the liner after each camping trip. Our sleeping bag inner liner weighs 18oz, which is slightly heavier than other similar products on the market. This is because our liner is made of more textured polyester material, which has a soft touch, good breathability, wear resistance, and is more durable. Travel Sheets for Hotel: The size of the sleeping bag liner is 86.5 x 37.3 inches, but after fully opening the zipper and unfolding the fabric, the size can be expanded to 86.5x74.6 inches. You can not only use it as an inner lining for sleeping bags, but also as a travel bed sheet.