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Sea To Summit
Thermolite Reactor Extreme Sleeping Bag Liner

4.697916666666667 out of 5 stars
96 Reviews

Out of Stock

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Staying warm means staying happy.

The Sea to Summit Thermolite Reactor Extreme Sleeping Bag Liner is a great way to get an extra season out of your sleeping bag or stay warm in unpredictable weather. Lightweight and highly breathable Thermolite fabric will add up to 25 degrees Fahrenheit to your bag’s temperature rating at a low cost of 399 grams added to your pack. The Reactor Extreme has a mummy shape to mesh with your sleeping bag and a draw cord hood that can be cinched up when it’s really cold.


  • Sleeping bag liner adds up to 25 degrees to sleeping bags
  • Thermolite insulation is light, breathable, and packable
  • Included stuff sack
  • Item #STS0084
Degrees Added
Stuff Size
6.5 x 4.5in
Claimed Weight