Cynthia P.wrote a review of Sea To Summit Reactor Thermolite Sleeping Bag Liner on February 11, 2017
Familiarity: I've used it several times
I bought this to use with the sleeping bag I rented for my Mt. Kilimanjaro climb and it saved my bacon. The sleeping bag was missing the string to "mummy" the bag around my head, so it was often challenging to keep the warm in and the cold out. I mummied up in this insert and it helped keep me warm enough, especially at Barafu camp.