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Sea To Summit Thermolite® Reactor and Reactor Compact Plus Liners (Adds up to 20ºF) chemical National Geographic's Trails Illustrated mapThe THERMOLITE Reactor Compact sleeping bag liner is the ideal choice for gram counters under 6 feet who want to add warmth to their sleep system. The worlds first hybrid sleeping bag liner uses a combination of two weights of THERMOLITE fabric, with the warmer fabric strategically positioned across the torso and in the footbox. The hollow core THERMOLITE fibers work like the hollow fur of a polar bear to trap extra insulating air. The Reactor Compact