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Sea To Summit
Thermolite Reactor Extreme Sleeping Bag Liner

2 out of 5 stars
1 Review

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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.


Details

  • Sleeping bag liner adds up to 25 degrees to sleeping bags
  • Thermolite insulation is light, breathable, and packable
  • Included stuff sack
  • Item #STS0084
Material
Thermolite
Shape
mummy
Degrees Added
25F
Stuff Size
6.5 x 4.5in
Claimed Weight
14oz

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Overall Rating

2 based on 1 ratings

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2 out of 5 stars

December 18, 2021

Unsure about the promise

Familiarity:
I've put it through the wringer

I'm 6'1", 185 lbs and generally sleep a little on the cold side. I bought this product to get my 20 degree bag (Cat's Meow) closer to zero territory, which would (theoretically) make it a little toastier for me in 20-30 degree F weather. I gave it a test run last week when temps here in Mass were about 25 degrees overnight. Around 3am, I got pretty cold and stayed cold until sunrise. Not freezing, but not comfortable either. It does not appear to give the advertised 10-20 degree 'bump' that it promises, but I will keep it as an ultralight option for summer. Also, my baselayers felt like they clinged to the liner, which twisted me up a bit in the bag.

Rick W