Stay extra warm during a chilly night camping under the stars. The Sea to Summit Reactor Thermolite Liner is made from a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Adds up to 15 degrees F / 8 degrees C of warmth to a sleeping bag or, used alone, is the ideal warm weather bag.Features: Lighter weight, more packable than fleece Adds up to 15 degrees F / 8 degrees C of warmth to a sleeping bag Mummy shape with a box foot Draw cord hood with mini cord lock Packs into its own 3 x 5" sil nylon stuff sack Specs: Length: 84" Width: 36" Weight: 8.7 oz Up to 15 F/Up to 8 C