Sea to Summit Reactor Insulated Sleeping Bag Liner

I took this mummy system on a trip to Maine on an overnight in temperatures in the single digits and teens. I was so warm, I had to unzip my sleeping system to let out some heat in the night. I am very happy with the quality of this sleeping system.

These really add extra warmth to your sleeping setup out in the back country. It's very light and compact when stored away. The liner is super comfortable on your skin and doesnt feel weird at all.

An absolute must for campers. It is insanely comfortable and warm. I am wearing as I write this review. I was shivering in camp last night under my down blanket. I woke up and put this bad boy on and slept like a babe the rest of the night. Love it. I have the breeze one for summer as well.

I'm pretty skinny. 6'4" and 180lbs. I'm always cold at night. I got this, and I was still pretty cold. Maybe it took the edge off, but I'm not sure how much of a difference it makes. I'll keep using it though.

So pleased with this purchase! I used it every night on a 10 day backpacking trip and it was great! It was an effective barrier from the nylon sleeping bag, so I didn’t stick to it and it was easy to clean when I got home.Also, it’s been great on other warm weather campouts when a sleeping bag would have been too hot.I think it’s definitely worth the spend!

I used this during a recent 3 day competition where we had to carry all of our gear and camp outside. Winter storm was predicted so I got this to bolster my sleeping bag. It got down into the teens and we had 5”+ of snow one night. This definitely helped keep me warm, especially sleeping on an ultralight foam pad.Packs down small and doesn’t weigh too much for the warmth it provides.Probably way overpriced for what it is (someone with basic sewing skills could probably make this for half the price), but if you need some extra insulation that doesn’t get too much in the way of sleeping, this is a good purchase.

Added at least 10 degrees to my sleeping bag and only added a little extra weight

Did not expect to like this thing since I have restless less and claustrophobia... BUT this is a wonderful piece of gear for my cooler backpacking trips.I have a sierra cloud10 down sleeping bag comfort to 25F, but we headed out for early Nov trip in upstate NY/CT border... temps down to upper 20s so didn't want to risk it. The liner didn't tangle around my legs, nice drawstring around my head and arm holes for functional access. Nice and toasty!!! Liner also served double duty as a leg warmer/blanket while making breakfast on a cold morning.Was skeptical at first, but so glad I bought this thing. Worth the extra ounces in the backpack!!