This is ultra-overpriced for what it is.. It appears to be of decent quality, but $80 for a cooling sheet is insane. Buy a cooling sheet and use that instead. Returning this immediately.

I used to have the older version of this liner, which didn’t open at the bottom, but I prefer this one much more. The ventilation is excellent when needed, making it an absolute must-have for any international trip. It works as a lightweight sleeping bag on planes, buses, and airports, and also doubles as a private, comfortable sheet in a questionable hostel—or even a hotel.Somehow, the fabric stays cool to the touch, even in warmer climates. Easy to wash. Small to pack. Absolutely perfect.I can’t imagine traveling without it. Thanks, Sea to Summit!

I like these liners and they are definitely nice and useful. However they are of a strange design that I'm still trying to get use to an figure out the best way to use them. I actually decided to get and test two of them. I have the standard Breeze liner in the compact mummy size and I have the Breeze liner with Insect Shield in the standard mummy size. The only difference between the two is of course the insect repellent part and the regular sized one is a little longer than the compact. Other than that they are pretty much identical. They are also both the same in width. The quality and construction seem to be top notch as with most Sea to Summit gear. At only 5'6" I can easily and comfortably fit inside both with no problem and with plenty of extra foot room. They are both also very soft and comfortable against your skin.They serve many purposes. For one they are great for helping to keep your sleeping bag clean. They are much easier to wash and can be washed more frequently than the whole bag itself. They can also be used on hot summer nights as a stand alone sleeping bag. Which should really appeal to the ultralight hiking crowd. They also help wick away sweat and keep your bag from sticking to you on hot nights when you do use them as a liner inside your sleeping bag. Because of the arm holes you can also actually wear this liner around camp on cool mornings or nights. However, you will look a little funny like you are wearing an extra long nightgown with a hood around camp!The part that is a little strange to me and that I'm still working on how I want to use it, is the whole arm hole thing. These liners actually have optional arm holes which I have never seen on any other bag liner. They have snap buttons that you can snap together above each shoulder to create the arm holes. The idea seems pretty ok and should help keep the liner in place, but it also makes it move with you when you roll over in your bag. Also your arms aren't being covered by the liner when using the arm holes. However you can also choose to not snap it together and just use it like a typical liner. I have tried it both ways. I definitely like using it the standard liner way because that's what I'm use to. However the arm hole way didn't seem too bad either, at least when used with my sleeping bag, but I still need more time before I make up my mind on that. The only thing I noticed is that sometimes when rolling over the upper part went with me, but the lower part would twist around my legs and I would have to work it around in the bag a little bit. It wasn't an extreme twist and didn't happen every time though.When it comes to the Insect Shield part, I don't know how to test that in depth. However, I can say that on the two nights that I used the Insect Shield liner the skeeters most definitely were out, and I didn't notice any bug problems at all throughout the night. So it seems like it works pretty well.As far as which one to get I look at it like this. Sea to Summit is known as an infamously expensive brand in the outdoors community. They are kinda thought of as a bougie, hippy, boutique brand. My point is if you can afford anything from Sea to Summit to begin with then you can probably afford the only 10 extra dollars that the Insect Shield liner cost. So you might as well get that one so you have that extra layer of protection from bugs. If you live where bugs aren't really an issue then of course you can go with the regular one and save the $10 for other gear.I personally am very happy I had an opportunity to get the liners through the Vine program. I very much like them overall and will definitely use them. However I personally would never spend $70 plus on any thin summer liner from any brand. A nice winter liner maybe, but not a thin summer one. If you are someone who can afford it and doesn't mind spending that much though, then I would definitely recommend giving one of these Breeze liners a try. They are definitely a nice bag liner.

I recently got some new semi-rectangular down sleeping bags and decided a liner was a good idea to help keep them nice. I also have two synthetic mummy bags I wanted to use this with. I got the standard mummy rather than the rectangular one because based on the specs it looked like it would be versatile enough to handle both shapes. It does. I am 6’ tall and this fits me fine.I have a number of Sea-to-Summit dry bags, stuff sacks, travel pillows etc. so I am familiar with the brand. The TL:dr is that this product is in line with excellent quality I expect from Sea-to-Summit. It is compact, well made and does what it says. It comes in a stuff sack too. I have no doubt this liner will hold up well to repeated use in the field. As someone who lead trips and has also traveled the world, I say buy once for quality rather than multiple times for price. Here is what stands out about this liner for me: The CoolMax fabric is comfortable and stretchy but not slick like some liners. It also has odor control for those extended trips although you can wash it on cold and line dry it. I found the overall design great for comfortable sleeping. When you are already in a mummy bag, having something else restrictive can feel like a little much. The arm holes with snaps are brilliant, ditto the open foot portion you can cinch. I love that freedom. There is a hood portion as well, and it also cinches. For an all-around sleep sack, this is a great choice. This is also coming with me when I travel internationally to places I need to provide bedding, or for extra comfort and cleanliness in sleeper cars on trains. After realizing this is super easy to get in and out of (step in, pull it up, arms in, done) you may see me sporting this on the plane on overnight flights.

I wanted something lightweight and packs down small to take with me when traveling by air. It seems like delays are becoming more and more common, so getting trapped overnight in an airport is a real issue. This bag allows me some level of comfort and protection, especially when sleeping on a nasty airport floor. I did get a standard mummy and do find it to be a bit tight on my 6'5", 235lb frame. I probably should have gone for the rectangular. The arm holes are very large and personally, I find them to be more of a problem than beneficial, especially when getting into the bag as body parts tend to go out those holes rather than the appropriate openings.Sea to Summit is an excellent and well-respected brand that makes high quality, durable, and creative gear. This liner is on par with their other products. If you are looking for something to go up a snowcapped mountain or sleep in a bus station this is a good but pricey choice. However, you'll get many nights sleep in it, even with multiple washings. Buy once, cry once.