Sea to Summit Reactor Extreme Thermolite Liner

1 review
5-star:   0
4-star:   0
3-star:   0
2-star:   1
1-star:   0


Weight 14 oz / 399 g
Dimensions 84 in x 36 in / 210 cm x 90 cm



Don't count on this liner for an additional 25 degrees…

Rating: rated 2 of 5 stars
Source: bought it new
Price Paid: Somewhere around $70


Don't count on this liner for an additional 25 degrees of warmth, or even 15 degrees.


  • Lightweight and small
  • Super-soft fabric


  • Does not deliver the warmth it claims
  • Was getting wrapped up and tangled in it

Very disappointed in this liner. I had my 30-degree bag and knew I'd be on the borderline temp wise. I'm a cold sleeper, and was excited to try this out. There is no way this 'increases warmth by up to 25 degrees."

Thankfully at the last minute tossed my fleece bag liner in the car. At 3 a.m. I finally gave up on the Reactor and switched to the fleece — and slept toasty warm for the rest of the night. I was surprised since I've read good reviews about other Thermolite Reactor liners.

I'd suggest testing it out—and having a backup liner—before you take this out into more extreme conditions. You could end up having a very cold night or possibly suffering from hypothermia.


Thanks for sharing your review, Auburn, and letting us know how the liner fared.

2 months ago