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Increases sleeping bag performance by up to 14 C 25 F with super-insulating 110g/m Thermolite fabric. Spacious design allows for a comfortable night s sleep even when the mercury plummets. Thermolite is a hollow core fibre that provides extraordinary warmth for its weight and remains extremely breathable. Adds warmth to a sleeping bag or used alone is the ideal warm weather bag. With the stretchy knit fabric that moves with you and a drawcord hood the Thermolite Reactor Extreme liner is perfect for wrigglers and rollers or anyone who needs some extra warmth. Tapered design from the foot to the head end to reduce weight and increase thermal efficiency. Mummy shaped with boxfoot design for superiro comfort.