DESC: Sea to Summit Thermolite Sleeping-Bag Liner Add up to 15 of warmth to your sleeping bag, or use this lightweight liner alone in warm weather. Thermolite is a hollow-core fiber that provides excellent warmth for its weight. Breathable nylon fibers keep you from feeling clammy. Mummy shape with a foot box. Packs into its own 5"H x 3" diam. stuff sack. Imported. Machine wash and dry. 8.1 oz.