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  • Western Mountaineering - TerraLite Sleeping Bag: 25 Degree Down - Navy Blue

Western Mountaineering TerraLite Sleeping Bag: 25 Degree Down

$495.00 - $540.00

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    • 5ft 6in/Left Zip
    • 5ft 6in/Right Zip
    • 6ft/Right Zip
    • 6ft 6in/Left Zip
    • 7ft/Left Zip

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    • Navy Blue


    16 Reviews


    Ultralight and ultra-comfortable.

    Western Mountaineering designed its TerraLite Sleeping Bag for comfortable sleeping whether you're camping or ultralight backpacking. Weighing in at only one pound and thirteen ounces, the TerraLite owes its lightweight quality to the 850+ fill premium goose down insulation that can keep you warm in the chilliest summer nights. The continuous baffle construction ensure the down doesn't isolate to one side, and the bag's comfort mummy shape includes a wider mid-section that allows you to sleep on your side comfortably.

    Western Mountaineering built the shell out of a sleek nylon ripstop for durability, and the taffeta lining remains plusher and softer against your skin. The TerraLite also features an insulated hood with an adjustable drawcord, a dual zipper design that either turns the bag into a wide comforter or attaches to other Western Mountaineering mummy bags, and an included stuff sack for your convenience. 
    • 25° F temperature rating
    • 850+ fill premium goose down insulation
    • Comfort mummy shape with continuous baffle construction
    • Nylon ripstop shell, taffeta lining
    • Insulated hood with adjustable drawcord
    • Dual zipper design
    • Stuff sack included
    • Western Mountaineering bags are made in the USA
    • Item #WES000A

    Tech Specs

    [shell] 12D nylon ripstop, [lining] 15D nylon taffeta
    850+ fill goose down
    comfort mummy (slightly bigger than standard mummy)
    left, right
    Max User Height
    5ft 6in, 6ft, 6ft 6in
    Shoulder Circumference
    65 in
    Hip Circumference
    68 in
    Foot Circumference
    [5ft 6in] 41in, [6ft, 6ft 6in] 42in
    Draft Tube
    Fill Weight
    [5ft 6in] 16oz, [6ft] 18oz, [6ft 6in] 19oz
    25 F
    Storage Sack
    Stuff Sack
    Stuff Size
    7 x 13in
    Claimed Weight
    [5ft 6in] 1lb 11oz, [6ft] 1lb 13oz, [6ft 6in] 1lb 15oz
    Recommended Use
    ultralight backpacking, camping
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    What an Amazing bag!

    • Familiarity: I've used it once or twice and have initial impressions

    Got my Terra light a few months ago... WOW! Probably the most comfortable bag I’ve ever had, the fabric inside is so soft, I fell asleep in what seemed like seconds! It’s extremely light and I had no cold spots. I could have gotten a cheaper bag but realized in the end I’d end up spending more money down the road to get the bag really wanted! If you can swing it, this is your bag. PS: if you are a side sleeper the bag will not roll with you!

    Huge Fan

    • Familiarity: I've put it through the wringer

    Before making the move to Western Bags I was using a big agnes bag with the built in pad retainer and was disappointment in the weight and comfort as a side sleeper. I'm so stoked this is the bag that I landed on for my lightweight backpacking kit. I live in Utah so my backpacking trips are mixed between the desert and the high alpine so I opted for the 25 degree bag with the option to add a sleeping bag liner for more warmth. I like having a sleeping bag liner in any case to keep my body oils/stank out of the bag and keep it nicer longer.

    I'm a big fan of the comfort mummy style because I can sleep super comfortably on my side and not end up on the zipper. The bottom of the bag stays on the pad instead of turning with you. Another feature I really love is the zipper on the bottom of the bag to release heat. It keeps you feeling cocooned and safe in your bag while your toes can peak out and dump heat at the bottom. I feel this makes the cooling a bit more even instead of drafting a cooling just one side of my body.

    I use a small Sea to Summit E-vent compression bag to carry this in my pack. It comes with a stuff sack but with 800 fill down you can really compress it. At home I store the bag in the big cotton storage sack Western Provided. It keeps it about the size of two queen sized pillows.

    I also use this bag when I sleep in our camper trailer sleeping on the bunk with my dog and he hasn't left any damage on it with his nails yet!

    Huge Fan

    Worth it for the price?

    • Familiarity: I've used it several times

    This is a super nice bag. It is light. It is comfortable. And it packs small for its size. The question is whether it is worth the price, and I would say it’s not. Marmot, REI, and others are making sleeping bags that are 90% as good for half the price. But if you want to treat yourself, buy Western Mountaineering.

    That said, I wouldn’t buy this particular bag as my go-to three-season bag. In an effort to be comfortable they made it super wide, which leaves big pockets of air that let in cold drafts. Also, unlike other models, they didn’t include a draft collar for some reason.

    Hey Cheryl, Thank you for writing. Some things to keep in mind regarding Western Mountaineering's value: We are made in the USA. Not China or anywhere else. Also, the down quality we use is incomparable. Why does that matter? When you have better down, the sleeping bag (or jacket or booties or whatever product) will last longer at the temperature range it was when you bought it. So the value is there.

    There is a higher price associated with Western for sure, but in exchange, we give you an incredible, premium product. The other brands are fine, for sure, but the quality, workmanship and materials will be equal to what you pay for the product. I do appreciate you writing this review; it's a valid comment that I am happy to address.

    Happy Trails!
    Western Mountaineering Rep

    As someone who is a side-sleeping toss/turner, I LOVE this bag. While I can see how the width might be an issue for some, it’s vital for me. The vast majority of bags are too restrictive for me - this one isn’t. The materials and workmanship are the best in the industry. I wouldn’t ever give this bag up!

    Having said all that, I very much agree with one thing - lack of a draft collar. That would bring this bag from near perfect to 100% perfect for me!

    Fantastic bag w/ a whoops

      Finally decided to drop some coin on a new bag. This will see some backpacking, a lot of tent camping, and some couch surfing. Just got it so I've only used it in mild conditions. Gorgeous bag. Well made. Comfortable. However, who decided it would be a good idea to put a Velcro closure just above the top of the zipper? It seems a superfluous component and when you're warm enough, not fully zipped, or just managing your bag, hello grabby tab! Not pumped about that aspect.

      Hey there - It's there to ensure that warmth gets locked in when all the way zipped. But perhaps another tab can be there optionally to make sure the grabby part doesn't grab you... just a thought. But it is necessary!

      I will pass this on to my friends at Western Mountaineering!

      Western Mountaineering Rep

      Side-sleepers dream bag

      • Familiarity: I've put it through the wringer

      I've had the TerraLite for over 3 years now. As a very restless side-sleeper, this bag is fantastic. I toss and turn all night and have to constantly change positions because of a bad back. The TerraLite enables me to bring my knees up closer to my chest and relieve nerve pressure in my lower back.

      The quality of Western Mountaineering bags are truly second-to-none. I fully expect this bag to last 20 years or more. While other manufacturers' temperature "survival" ratings are sketchy at best, WM is known to over-deliver. Overnight in the High Sierras it dropped down to 23F and in just long underwear I was perfectly warm. Recently up on Mt Rainier in February and it dropped to 14F. Did need to put on a down jacket and pants, but once I did I was toasty.

      Fantastic bag from a clearly exceptional company. I don't foresee buying anything other than Western Mountaineering bags in the future. Keep up the high quality work WM!

      Kevin K: I'm what you might call a rather active side sleeper, Tried a lot of pads over the last several years and my preference is the Exped. I have both a DownMat and a SynMat . Pad comfort is a very individual thing but the Expeds have worked very well for me. My SynMat has a lot of time on it, no issues with either pad.

      Best of luck to you.

      Funny enough, I also use the Exped SynMat 7 and love it. I've had several different mats from REI and Therm-a-rest and the Exped has been my favorite. The key to side-sleeping comfort is not inflating the pad 100% to prevent hip pressure. The "thicker" the pad, the more air you can leave out of the pad to provide more "sink" to alleviate hip pressure while still not touching the cold ground.

      Thank you for your review! This is immensely helpful! This has been on my wishlist for quite some time but I’ve held off on buying a sleeping bag for that reason (back/hip combined with being a fidgety sleeper).

      I have a Big Agnes Double Z pad that I quite love...wondering if it would work with this.

      You're most welcome Allison. Your Big Agnes pad should work just fine with this bag. The shapes are pretty similar, though the TerraLite might be a bit wider at the bottom because of the taper of the pad. If you're a side-sleeper, this should be less of a problem since your feet wont be down at the bottom of the pad anyway. Just keep in mind that your Agnes pad is essentially not insulated and intended for warmer weather with an R value of 1.5. If you do any colder camping (especially on snow) or are typically a cold sleeper, you might want to consider a more insulated pad with a higher R value.


      • Familiarity: I've used it several times

      This is a great, decently weighted bag for a restless sleeper. Very warm. Does not pack down well however. I had difficulty getting the right stuff sack size, ended up with a 12L compression and it still took up quite a bit of room. Other than that, if you want something that you can sleep cozy and comfortably in without feeling strangled by your bag and you're not a quilt person, this is a great option

      I really like this bag

      • Familiarity: I've used it once or twice and have initial impressions

      I was sure I wanted a quilt because of the extra width for a restless sleeper. But I needed a bag sooner than anyone offered, so I started looking for off the shelf. Can't say enough about going from synthetic to down in weight. I love the extra wide space to roll over. I don't feel claustrophobic. I'm not sure of the fabric, but it feels like the water repellent fabric offered on the inside fabric of other bags I have seen. However, this bag has it on both the inside and outside. It is super soft. I have only used it once sleeping inside my land cruiser when temps got down to about the mid 40's and of course it was warm enough. I'm not sure it would keep you warm down to 25. I should add, the truck was covered with condensation in the morning and I packed up the bag first thing in the morning without any dampness issues. Only cons: It is more expensive than a quilt, but you are paying for more material. And of course it doesn't pack down as small for backpacking either.

      Great Bag

      • Familiarity: I've put it through the wringer

      The WM TerraLight 25 is exactly what I was looking for - very light, versatile temperature rating, easy to open up, plenty of room to toss and turn for a restless sleeper, room to add layers if needed, seals up tight when cold and it's needed. Love the fool-proof no-snag zipper.

      Warm, Cozy and Light!

      • Familiarity: I've used it once or twice and have initial impressions

      Took the TerraLite out for the first time two weekends ago. The temperature dropped below what we expected and we had high winds. I was pretty cozy in my bag except for the occasional cold spot (most likely due to the wind coming into the tent combined with low insulation on my sleeping pad). Highly recommend this bag for anyone that is a side sleeper like me. I'm frugal but this bag is an investment for sure.

      A shape beyond compare

      • Familiarity: I've used it once or twice and have initial impressions

      What makes this TerraLite so amazing is that it's shape is more of an "egg shape." It allows for great movement inside, while not having so, so much room (dead air) at your feet. So consider this one an efficient bag with room!

      You will love it!

      Western Mountaineering Rep

      Couldn't ask for more.

      • Familiarity: I've put it through the wringer

      I bought my first down bag something like 35 years ago. It was a Sierra Designs mummy bag with probably a zero degree temperature rating but I don't remember. It was great to have a down bag with all the advantages of warmth, light weight and compressibility but l just couldn't stand the confining shape of a mummy and you couldn't zip it without the draft tube material getting caught in the zipper. Since then I've had many other good quality bags but once I got serious about saving weight for backpacking, I researched all my choices and landed on the Terralite as the perfect weight, shape, temperature rating and quality. I've used my Terralite in Sequoia National Park and Rocky Mountain National Park on about ten trips now ranging from spring, summer and fall. I ended up buying a second one of opposite zipper side so I could make a double for when my wife is with me or for my 11 year old son to use. My son and I just returned from RMNP at the first of October where on our second day it started blowing snow with high winds from early evening till morning. We were camped at 10,600' and the temperature got into the low 20s. We ended up spending a lot of time in our Hyperlite Mountain Gear Ultramid 4 tent (which I also highly recommend!) laying in our bags and reading or sleeping as the weather raged outside. We were both very comfortable and warm with plenty of room to move around. I was a little worried before the trip because this was the latest season I'd be using these bags so I looked at some of the liners like Sea to Summit Reactor to add warmth but decided I didn't want to carry the extra weight. As it turned out we stayed plenty warm and I couldn't be happier with these bags. I use Thermarest Neoair Xtherm 25" wide pads to take advantage of the Terrallites width. also gets five stars for their excellent service, staff and shipping.

      Couldn't ask for more.

      Graduation Gift

      • Familiarity: I gave it as a gift but have feedback to share

      I gave a pair of these to my brother and sis-in-law for a graduation gift. They took them on a trip to Iceland for two weeks and camped all along the way. Their feedback was that they were perfect and the best bags they have ever used.

      Awesome and better than I could dream

      • Familiarity: I've used it once or twice and have initial impressions

      WM Terralite sleeping bag is awesome. I used it on two trips already and it's really amazing piece of gear. My impression may be biased a bit, because I have started to use it together with Exped's Downmat UL7 (which was waiting nearly half of year to go to mountains from the box), and it provides even more comfort. Sometimes I'm thinking about taking just a bag and old good foam mat to next trip, just to have impressions from sleeping bag change alone, but downmat is too comfortable to resist.

      Regarding sleeping bag, I like how roomy it is. This was one of the main reasons I wanted Terralite, and it really works cool. I'm side sleeper mainly, and it gives me chance to turn, curl or do whatever I want inside while sleeping without any limitations.

      At the same time, it's very warm. I hadn't chance to push limits with it yet, but in near freezing temperatures I had impression that it is much warmer than it's rated (based on my previous synthetic sleeping bag, which weights... wait, it was almost two times heavier - regular Terralite is 830g - measured! vs 1600g) Also, loft was surprising for me, I never saw so comfortable and soft sleeping bag before. Combined with downmat it feels like you are sleeping in a good (and I mean really good!) bed. To be honest, these trips were the first time when I had no wake-ups during whole night. Usually it was like "wake up - turn around - and sleep again" few times a night.

      Hood was comfortable to me, but I don't think I'm requiring guy in this area. Also, I really like option to unzip bottom part of the bag to make it almost rectangular blanket. I think I will be using this feature in the summer more often, to control temperature, because currently I plan to use it in warmer months as well and zipped it may be too warm.

      To compress it I use Granite Gear eVent Sil Compression Drysack - size XS/10L. Bag compresses well to quite small block. Sack which came with sleeping bag is "just ok". By the way, this sleeping bag ships uncompressed (at least mine was) which I believe is very good for down.

      Overall my impressions so far are that this became likely one of my favorite pieces of gear right from start, I do not see anything which could be considered as "cons". Even relatively high price is easily justified with high quality materials, awesome weight/warm ratio and unique unzip bottom feature. And, again, it's very, very roomy, which makes sleeping very comfortable.

      I feel that I need to say thanks to Kyle L. here, who was very helpful with his advices and assistance.

      Fantastic Bag!

      • Familiarity: I've used it several times

      If you are considering this bag, it is absolutely fantastic! After years of suffering with my old slumberjack qualofil bag that just could not keep me warm during July and August adventures to the High Unitas, I finally splurged and purchased the bag of my dreams! As on who hates mummy bags to begin with, I am totally in love with this one! The bag is wider in the midsection that any I have seen and at 6'2" and a side sleeper I can actually curly my knees up in this bag. I am so satisfied after this seasons trips that I will never regret the fact that this was way more money than I have ever spent on a sleeping bag before. Western Mountaineering ROCKS ! ! ! You simply will not be disappointed with this product! Only wish I could give it 10 stars!


      • Familiarity: I've put it through the wringer

      I have used this about twenty days in the field since I purchased it from The Mountain Goat in Manchester, Vermont. I am a hair shorter than 6' and 175 lbs and I ordered the 6'6" terralite. First let me say that I absolutely love this bag. It's a roomy as it needs to be. Its big, but not too big. It's nice In the winter, you can easily take it down to below twenty with a down jacket inside (There is plenty of room.) I put layers in with me and do not feel any constriction. I've used it in my hammock as a blanket on warm nights and as a bag when it's chilly. I've been rained on lightly at night in a hammock with no tarp, and the bag was barely damp in the morning. It's been both in my tent as well, and I've found it to be a little long. The feet will get condensation from touching and I won't notice because I'm not touching the end. I only really notice it after I'm out if the bag. I've even used it as a blanket on my friends couch. The bag weighs under two pounds, but is no compromise in comfort.

      All that being said, at first I wasn't quite sold on it. The lack of a baffle combined with a zipper along the feet made me a little nervous, but remember this isn't your normal mummy bag. The shape of it still holds warmth in nicely. And YOU CAN BEND YOUR LEGS! Your feet don't have to stay at the bottom.

      Bottom line:

      I trusted western mountaineerings reputation for the highest quality sleeping bags and they surpassed my expectations. The fabric is sturdy despite its light weight, the stitching really is perfect, and the zipper won't snag. If you want a versatile and quality bag for any situation that weighs under two pounds, you won't be able to find something better.


      What are the EN ratings for this bag? Both limit and comfort.

      I'm trying to find a good mattress for this bag. Right now I'm using closed cell foam but would like to upgrade to an air mattress. Off the bat I looked at the NeoAir Xlite but it is quite narrow for such a wide bag. Can anyone recommend a very lightweight mattress that would be a good match for this bag? It would be even better is it came in a short and wide option. I'm just starting this search, but so far I haven't found anything and I'm thinking this product may not exist at the moment. Thank you!

      Hey there Regan!

      I think you would benefit more talking directly with one of our Expert Gearheads! We like to get into awesome discussions and really provide you with the information on current gear! A mattress is typiacally a bit more wide than any sleeping pad so we could also talk a bit more and get you the perfect set up!

      Klymit Static V Luxe Sleeping Pad might be a great option for you but we could talk further and find the best choice!

      At 5'11", I'm a little concern the 6' is too short/not roomy. 6' or 6'6"? Just don't want to go 6'6" if not needed as I'd prefer to avoid the extra weight/bulk.

      James, at 5'11", you are totally good with a 6'0" bag. we measure the person, not the bag. If you go up to a 6'6", I would be concerned that you would waste too much energy heating up the extra inches. Hope that helps!


      I'm 5'8" and 160 lbs. I'm a little concerned that with the wide cut of this bag, I'd be swimming in the 6ft length and have trouble heating up all that volume. Anyone my size have experience with this bag?

      Hey Andrew - I Love the room, but that's me. If you are looking for more narrow, look at the 20 degree Ultralite or the 25 degree Sycamore. The Ultralite is way more narrow, the Sycamore is in between, but it is semi rec. Hope that helps!


      Western Mountaineering Rep

      I recently purchased this bag and have a question about smell: When I first bought it and tried it out at home, it didn't have any odour. After sleeping in it for 1 night with my clean base layers, I noticed the bag had a funky smell to it that was very noticeable. Can anyone speak to why this may happen? I've heard that it is the natural smell of down but that doesn't account for it not smelling initially... As I mentioned, I had clean base layers and wasn't sweating in the bag or anything like that. I've only seen one review in which someone had this same problem....

      Best Answer

      Thank you ! I spoke to someone and they said it could be "moisture from my natural body oils". They also said that other ppl have had the issue and after washing the bag, it was mitigated. If I go that route, what is the optimal way of machine washing this particular bag?


      Daniel, that's exactly what the folks from Western Mountaineering said: "The down can have an odor, which is more noticeable when it becomes wet. Depending on humidity levels wherever the bag is used, a bag could seem to not have any odor initially and then if it is used again with a change in humidity levels or environmental conditions(i.e. sleeping in an enclosed room, a cabin with windows shut, or a zipped up tent vs sleeping out in open air plus taking into consideration variations in humidity levels on any given night where the bag is being used) the same user might notice an odor.

      There are many factors that can play a role, but a combination of closed quarters and higher humidity levels usually will lead to more noticeable odor from the insulation. If they are concerned and it continues to be a problem, they can certainly send it back to us for evaluation."

      Nikwax makes a product called Down Wash that I would recommend. And please use front loading washers and large dryers (with a tennis ball!) only.



      How long before you get 6ft left or right again?

      Will you be offering options with left/right zipper? I'm assuming that two of these bags can be zipped together?

      Hi Kasia,

      Looks like we have some of these bags on order in both left and right hand zip. We should be getting them end of June/early July.

      If you need anything else, please hit me up directly.

      Matthew Pizza

      Expert Gearhead