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.

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.

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.

G'day Bella,

No, the Sea to Summit Thermolite Reactor Extreme Liner does not have a zip.

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.

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.

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.

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.

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.

G'day Sharon,

The Thermolite Reactor Extreme Liner is just available in the one length which is 210cm long.

G'day Maz,

Unfortunately that information is out of date, there is only one length available in each model of the thermolite liners now.

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.

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. 

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. 

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! 

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.

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.

G'day Ian, 

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.