The Thermolite® Reactor 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