Sea to Summit Reactor Plus (Compact) - Thermolite® Mummy Liner

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Quick overview

The Sea to Summit Reactor Plus (Compact) THERMOLITE® Mummy Liner sleeping bag liner is the ideal choice for gram counters under six feet who want to add warmth to their sleep system. The world’s 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 THERMOLITE® fibers work like the hollow structure of a polar bear's fur, which traps extra insulating air. The Reactor Compact Plus keeps your sleeping bag clean, plus it's super easy to wash.


  • Traps insulating air to increase warmth of a sleeping bag by up to 18°F / 11°C
  • Stretchy, Thermolite® fabric is incredibly comfortable
  • Lighter weight and more packable than fleece
  • Technical mummy-shape with drawstring hood
  • Easy care – machine wash with no special soap needed. Avoid fabric softeners and dryer sheets

Sea to Summit Reactor Compact Plus Liner
Compressed volume (L) 1,0
Dimensions (cm) 183x92 
Packed size (cm) 15x11
Weight (g) 263

  • Keeps sleeping bag clean
  • Packs into its own Ultra-Sil stuff sack