Sea to Summit Thermolite Reactor Extreme Sleeping Bag Liner

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This Sea to Summit Thermolite Reactor Extreme sleeping bag liner adds a full 25°F of warmth and extends the life of your sleeping bag.


  • Constructed of insulating Thermolite® fabric, a hollow-core, breathable fiber that provides extraordinary warmth for its weight
  • Adds up to 25°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
  • Comes with a lightweight Ultra-Sil™ stuff sack
View all Sea to Summit Sleeping Bag Liners

Technical Specs

Best Use


Sleeping Bag Shape


Added Warmth (F)

Up to 25 degrees

Added Warmth (C)

Up to 14 degrees

Stuff Sack Size

3 x 5 inches




84 x 36 inches


14 ounces

356 reviews with an average rating of 4.4 out of 5 stars

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