The Sea to Summit Thermolite® Reactor Sleeping Bag Liner increases sleeping bag performance by up to 8°C with 80g/m² Thermolite® fabric. It is ideal as part of a cold climate sleep system, or as a standalone bag in warm weather. The Thermolite® Reactor is made from the lightest of Thermolite® fibres. Features Adds warmth to a sleeping bag Mummy shape with a box foot Draw cord hood with mini cord lock Packs into its own UltraSil® stuff sack Lighter in weight, more packable than fleece Machine washable Colour: black Dimensions and Weight210 x 90cm248g Sea to Summit Thermolite Reactor Sleeping Bag Liner