Katiewrote a review of Sea To Summit Thermolite Reactor Extreme Sleeping Bag Liner on November 1, 2018
Familiarity: I've used it several times
The fabric is so soft! Despite being heavier than I'd like, I really enjoyed this liner. I plan to use it for very warm weather backpacking trips instead of a sleeping bag, but haven't done that yet. So far, I've used in conjunction with my 30 degreee Montbell sleeping bag during cold nights. It definitely doesn't add a full 25 degrees from my experience, more like 15.