The Sea to Summit Thermolite Reactor Extreme Liner increases sleeping bag performance by up to 25 F (14 C) with super-insulating 110g/m Thermolite® fabric. Thermolite® is a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Spacious design allows for a comfortable night's sleep, even when the mercury plummets. Perfect for extending the season of your sleeping bag.
110g/m2 Thermolite® construction throughout
Adds up 25°F (14°C) to warmth to a sleeping bag
Mummy shape with a box foot
Draw cord hood with mini cord lock
Packs into its own Ultra-Sil™ stuff sack <