(64)
Sea to Summit Thermolite Reactor Extreme Liner
Details & Specs
The ultimate solution to extending the warmth of your sleeping bag, the Sea to Summit Thermolite Extreme Reactor Liner increases comfort without adding excessive weight and bulk to your adventure kit.
Made with 110g/m2 Thermolite® fabric, the Thermoilite Extreme has a spacious design and stretchy fabric to cater for tall and restless sleepers and a drawcord hood to really trap the warmth when the mercury goes south.
The liner also increases the life of your sleeping bag as they are much easier to throw in the washing machine than your expensive technical sleeping bag.
- Mummy shape with box foot
- Adds up to 15°C of warmth to a sleeping bag
- Drawcord hood stretch fabric
- Machine washable
- Includes stuff sack
Shape:
Tapered
Max. User Height:
210 cm
Internal Girth:
180 cm
External Dimensions:
210L x 90W cm
Packed Dimensions:
17L x 11W x 11H cm
Weight:
0.399 Kg
Material:
110g/m2 Thermolite®
Suggested Use:
Hiking | Trekking
Warranty:
Limited Lifetime
Supplier Code:
AREACTEXLONG
Snowys Code:
14687
Reviews
(64)
4.7
64
(64)
Q&A's (15)
Warmer sleeping 1 answer
I have a BlackWolf minus 5 sleeping bag and will be crossing the Nullarbor in May Now I have two other s/bags so I don’t want to purchase another Seeing this S to S reactor liner how much warmer would I be Would my minus 5 drop down better than minus 10 or more
Barry - Melbourne, VIC(3 years ago)
G'day Barry,
I think you've asked a question about liners adding extra warmth to your bag on a different liner - I'm sorry if you didn't receive that answer, which is mostly the same.
There is no liner than exists on the market that will turn your bag into a -10ºc or more bag. At best you may get a degree or two warmer because when we are talking minus temperatures the difference between 1-2 degrees is much more significant than than warmer temperatures.
Adding something like a folded up woolen blanket to your sleeping mat underneath you can help. If you have more than one, layering one ontop of the other is going to do a better job than a liner. You would put the lighter bag ontop.
Hope that helps, please give us a call on 1300 914 007 so we can talk through some other ways you can potentially sleep warm.
Lauren - Snowys(3 years ago)
Will this fit over a s2s ether light xt large?1 answer
Hi, I'm keen to use a liner as part of a sleep system with a quilt and my sleep mat. In warmer weather I will use the liner as a bag on its own. However, when I use my quilt I don't like sleeping directly on the mat - will the s2s ether light xy (large) mat fit inside this liner so i can use it like a bottom sheet over my mat and just have the quilt on top? Thanks in advance!
Chris - Canberra, ACT(4 years ago)
G'day Chris,
We've tried this out in-store with our display stock, and yes, you can use the Thermolite Extreme Reactor Liner as a base sheet over the Ether Light XT Large mat.
Lauren - Snowys(4 years ago)
What to wear when using bag/liner1 answer
Does the performance of a bag and liner get affected (reduced) by someone wearing too much clothing? Example - Should you just wear a set of long John’s on a cold night or add multiple layers on as well.
Rob - Newcastle, NSW(5 years ago)
G'day John,
It's worth having a listen to our Sleep System Ratings Podcast with Dean from Sea to Summit, as they do discuss some of these things. In general, a set of long johns will help to keep you warmer in your bag, just be sure that the long john's aren't cold when you get in the bag. A round of starjumps or a slight warm-up near the fire can help ensure your bag will be as toasty warm as can be.
Leece - Snowys(5 years ago)
S2S liner extreme1 answer
Does it have a zip on the side?
Bella - Halls Head, WA(5 years ago)
G'day Bella,
No, the Sea to Summit Thermolite Reactor Extreme Liner does not have a zip.
Lauren - Snowys(5 years ago)
Traveller 1 combo1 answer
Does this couple well with the traveller 1? I like the lightweight summer options of that bag, but am interested how hard that bag can be pushed with the extreme reactor. I understand it might not get me into the depth of winter. Most of my camping is warm weather stuff, but the reactor extreme seems like a good weapon to carry alongside the traveller just incase it dips a bit at night? I use a thermalite mat, too, which gives me a pretty good head start on warmth. ðŸ‘
Ian - Noarlunga(5 years ago)
G'day Ian,
The Thermolite Reactor Extreme will help expand the temperature range of your sleeping setup, however, based on reviews and personal experience the additional 15'C is a bit of a stretch. When paired with the Traveller 1 I think you'd likely be ok down to about 5'C if you're on a well-insulated mattress. Sleeping bag warmth is quite subjective and can be influenced by a range of physiological factors, so I'd recommend always planning ahead and packing options for layers and the like.
Leece - Snowys(5 years ago)
Will this work with a 20 degree bag?5 answers
I'm looking at a Macpac escapade 150 bag for bikepacking, its rated at 20 degrees. I dont plan on ever going lower than 5 degrees ambient air temp, would this be ok to pair with it?
mark - Geelong(5 years ago)
G'day Mark,
The Thermolite Reactor Extreme will help to improve the overall temperature rating of your bag, however, it doesn't explicitly mean that you'll be able to use this in combination with your 20-degree bag to go down to 5-degree temps. Your whole sleep system will contribute to how warm/cold you'll feel, so if you're planning to use this combination in winter I'd recommend a good tent/bivy and a well-insulated mat, and be sure to pack some spare thermals as it might be a little chilly.
Leece - Snowys(5 years ago)
Thanks Leece, what lightweight bag - under 900 grams would you recommend then?
Mark - Geelong(5 years ago)
Hi again Mark,
It really depends on your budget, but the lightest and most compact option will be a down bag or quilt. Sea to Summit have a range of options that come in under 900g in this temperature range. The Spark SP2, Ascent AS1, and Ember Eb1 and Treeline Tl1 (just under 1kg) are all great options with down fill. Marmot does a few options as well, with the Never Winter Bag that has down fill, or the Trestles Eco with synthetic fill.
Leece - Snowys(5 years ago)
Hi I have a sleeping bag at 2 . will this liner to help down to -5? thanks. I heard silky liner is warmer, any advice? thanks
Ana - Coombs(5 years ago)
G'day Ana,
Again, unfortunately, there isn't really a hard and fast rule here in terms of how much warmer you'll be, as you need to take your entire sleep system into account. We'd always suggest carrying a sleeping bag with a comfort temperature in the temperature range you need. The liner can add some extra warmth as needed if the conditions are colder than expected, however it's not realistic to expect the liner to perform in the same manner as a suitable sleeping bag will. Silk liners won't provide any extra warmth, they are designed to keep the inside of your sleeping bag clean, and reduce oil transfer from your body. We'd recommend listening to our sleep systems podcast for some more in-depth information.
Leece - Snowys(5 years ago)
Any anti-insect/bacteria treatment?1 answer
Does this liner have any anti-insect or bacterial treatment applied? I prefer to avoid these in case of any health effects.
Bruce - Perth(6 years ago)
There is no insect treatment on these sorry, Bruce. you can apply it yourself though with a product like Equip Debugger, check it out here.
Ben - Snowys(6 years ago)
How do you order the long length online? I can't find a way to specify LONG.3 answers
The only product listing I can find is for the regular length. How can the long length be ordered?
Sharon - Mount Martha(6 years ago)
G'day Sharon,
The Thermolite Reactor Extreme Liner is just available in the one length which is 210cm long.
Leece - Snowys(6 years ago)
The sea to summit site indicates a 235vm length. It’s a pity you don’t stock them
Maz - Tyabb(6 years ago)
G'day Maz,
Unfortunately that information is out of date, there is only one length available in each model of the thermolite liners now.
Leece - Snowys(6 years ago)
Which S2S liner is warmest?1 answer
Hi, I’m looking for the warmest sleeping bag liner. Would it be the thermolite fabric reactor extreme or the thermolite reactor fleece liner?
Emily - 7320(7 years ago)
G'dau Emily,
The Thermolite Reactor Extreme Liner can add up to 15 degrees of warmth to your sleeping bag, however, we do want to clarify that there is no substitute for carrying a sleeping bag that will suit the comfort temperature required. These liners will help add a little more warmth than most fleece liners, however, there are lots of factors that determine how warm or cold you'll be, so we'd suggest making sure your entire sleep system is suited to the conditions you need to use it in.
Leece - Snowys(7 years ago)
What temperature would you rate this to as a summer sleeping bag? 1 answer
I’m camping in tropical Sumatra next month & am considering taking a liner like this rather than a sleeping bag. Former questions suggest that’s this liner is suitable for a warm climate sleeping bag - but could you be more specific as to what overnight temperature you’d rate it at? Thanks
Julie - Fitzroy North(8 years ago)
G'day Julie,
The Sea to Summit Thermolite Reactor Extreme Liner doesn't have a temperature rating per say, so I'd be a little hesitant to throw a concrete number out there on it. It is designed to add about 15° to your sleeping bag, so I think it should still be able to add about 15° to your body when used on its own. With that being said, I'd think you'd probably want to be at about the 25° mark when sleeping, so probably wouldn't risk using it on its own when it's any less than maybe 15° outside, just to be safe.
Ben - Snowys(8 years ago)
Can this be used as a light blanket?1 answer
I can't see anywhere if the liner unzips or is just a bag piece. Thanks!
Ash - Geelong(8 years ago)
G'day Ash,
The Sea to Summit Thermolite Reactor Liners all just have a drawstring around the opening but no zipper. Unfortunately theywon't open like a blanket. You can certaily use it on its own but I'd only advise it for warm summer nights.
Tim - Snowys(8 years ago)
Suitable as a summer sleeping bag?1 answer
Would this liner be suitable to be used as a summer sleeping bag in warm conditions?
Donny - Bundaberg(9 years ago)
G'day Donnie,
Certainly in really warm weather these make a great, lightweight sleepng bag on their own. Just be careful to check the overnight temeratures, I've been caught out once doing this and it got a little cold early in the morning. If in doubt, take your sleeping bag!
Tim - Snowys(9 years ago)
Width at bottom?1 answer
Just wondering what the 90cm width tapers to at the bottom?
Dan - Sydney(9 years ago)
G'day Dan,
I've just grabbed a display model of the Sea to Summit Thermolite Reactor Extreme Liner and it narrows down by about 10cm at the foot end. The fabric is quite stretchy, so there is a fair bit of give to it as well.
Ben - Snowys(9 years ago)
Difference in length of liner1 answer
What is the difference in length between the regular and long sizes?
Vanessa - Narromine(9 years ago)
G'day Vanessa,
That's a good question, sorry we haven't made it clear on the website (I'll get that updated). The long is 235cm and the regular is 210cm so that's a difference of 25cm.
Sarah - Snowys(9 years ago)
Sizes of Reactor Extreme Sleeping Bag Liners1 answer
Are the dimensions given for these liners in the stretched or unstretched state. I ask as I am 190cm tall and usually get the long version of products like this. It seems strange that the regular size fits people up to 210cm.
Ian - Cairns(9 years ago)
G'day Ian,Â
I've just double checked for you on the packaging of this product, and this liner is definitely 210cm long. It also says that this liner is made to be 'spacious' so that may explain why it is larger than usual.Â
Emily - Snowys(9 years ago)
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