BROWINTThermolite Sleeping Bag Liner with Zippers for Cold Weather, Lightweight Mummy with Hood & Rectangular Sleep Sack for Adult, Adds Warmth, Thermal Travel Liner, All Season

I slept like a baby in this, between bug protection, keeping my sleeping bag clean, the soft jersey feel helped me fall asleep quickly. Love the size, cost, weight for carrying and how warm it keeps me.

I wish it had a system to secure the liner to my sleeping bag.

This is a great sleeping bag, whiner thermal light, the dual zippers that gives you the ability to open it up and use it like a quilt if needed to with a sleeping bag on top like versatility of it.

I tend to sleep hot so I ordered the lighter weight liner. It's like a stretchy sheet that envelopes you. It was nice because the sleeping bag material feels cold so I could pull this around me and over my shoulders to lessen the initial chill. Once things started to warm up I could unzip my sleeping bag yet keep this zipped around me cooling things off yet keeping warm at the same time. If I was still too warm I could unzip the liner but still keep it around me to further adjust the temp. My legs were usually the area too hot so I could unzip it and keep my feet and upper part covered.The bonus is that this helps keep your sleeping back cleaner and is easier to wash. It'll also be great in the summer.I like the zippers though I think it would be useful to have 1 zipper up the middle instead of 2 on each side. I sleep in a hammock and had trouble figuring out the front flap at times - it would be useful to make the front flap a different color. I didn't have too much trouble getting tangled up in this but the different colors would help keep it straight. I used a Sharpie to help with that.

I use this in my indoor hammock to prevent CBS (cold butt syndrome). It is super comfortable and has plenty of room for one person. It does stretch enough that it never feels confining. It is sheer enough that you can see out of it, but thick enough that you can't see into it. It has the weight and feel of a very soft jersey sheet. It seems to be well made and I have had no issues with the zippers. Neither zipper goes all of the way to the bottom, but that is not a concern for me. By itself, I would not rely on this to keep you warm, but as a travel sheet or a sleeping bag liner, this would be great!

I can’t speak for the rectangular version, but the mummy version is undoubtedly the most frustrating and useless piece of camping equipment I’ve ever owned. I cannot believe someone put their name on this thing…it was very clearly never tested in a realistic situation.The way this item works to keep you warm is by forcing you to fight it for your life all throughout the night. It does not stay in place AT ALL, and unless you get into and have someone zip you up in it and your sleeping bag and you *do not* move outside of breathing, it will work. Otherwise, it will simply try to strangle you around your neck, waist and feet at the same time, to the point you will expend an absurd amount of calories on removing yourself from the sleeping bag and liner to ‘refit’ the liner every time you adjust yourself.I ended up just not using it (I slept better being a little cooler, but not being constricted awake every time I moved at all). I returned it the day after I returned from my trip…honestly, if it had been outside the return window, I would have just shredded it up and used it for fire-starting in the future. I know it’s a cliche, but I would definitely give this a negative 2-star review. It’s genuinely so bad that they should be paying people to use it.

I purchased this liner for a hunting trip to Colorado. It got very cold at night in to the single digits most nights. It's works trust me!

This bag liner was perfect for my trip to Big Bend. The first night out, temps dropped into the low 20s with a feels like in the teens. I used this liner with a 20 degree rated sleeping bag and I was toasty all night.