Sea To Summit

Sea to Summit - Reactor Plus Compact Sleeping Bag Liner

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  • Regular price $68.00

The 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 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 hollow core THERMOLITE® fibers work like the hollow fur of a polar bear to trap extra insulating air. The Reactor Compact Plus keeps your sleeping bag clean and is super easy to wash. It will bump up the warmth of your sleeping bag considerably, depending on your metabolism, your sleeping bag and sleeping pad, and the environment.


  •  Constructed of insulating Thermolite fabric, a hollow-core, breathable fiber that provides extraordinary warmth for its weight
  •  Combined with the regular 80g/m² Thermolite, super insulating 110g/m² Thermolite panels provide added warmth in the torso and foot bed areas
  •  Adds up to 20°F of warmth to a sleeping bag; can also be used as a summer ultralight sleeping bag
  •  Liner helps keep the inside of your bag clean, saving it from the wear and tear of washings
  •  Drawcord hood with mini cordlock cinches around face to hold warmth in
  •  Mummy shaped liner features a 3D footbox providing plenty of room for feet
  •  Sea to Summit Reactor Plus Themolite comes with a lightweight Ultra-Sil™ stuff sack
  •  Compact, short design is ideal for women or anyone under 6 ft. tall


Technical Specs

Best Use


Sleeping Bag Shape


Added Warmth (F)

Up to 20 degrees

Added Warmth (C)

Up to 11.1 degrees

Stuff Sack Size

4 x 6 inches




72 x 36 inches


9.3 ounces