The first liner of its kind, the Reactor Thermolite Mummy Liner from Sea to Summit incorporates Thermolite material from Dupont. Thermolite is a hollow-core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Lighter weight, more compact, and warmer than fleece liners. Adds up to 15°F degrees of warmth to a sleeping bag. Can be used on its own as a warm-weather bag. Thin drawcord with tiny cord-lock around the hood. Mummy shape with a box foot. 100% Polyester.
• Sleeping bag shape: Mummy
• Added warmth: 15° F / 8.3° C
• Stuff sack size: 3″ x 5″
• Material: Polyester
• Dimensions: 82″ x 35″
• Weight: 8.1 oz. /.23 kg
Before You Order
Compare the 82 by 35 inch dimensions, mummy shape and listed warmth addition with your sleeping bag before ordering part 119.
Frequently Asked Questions
What shape is this liner?
The listing describes a mummy shape with a box foot.




