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4.4 7

Sea to Summit

Thermolite Reactor Liner

or 4 easy payments of $13.73 with

Delivery estimate to:

Pickup from our store

92 Richmond Rd, Keswick SA Mon - Fri: 9am - 5.30pm
Sat: 9am - 5pm
Sun: 12pm - 5pm
17 Doherty St, Brendale QLD Mon - Fri: 9am - 5.30pm
Sat: 9am - 5pm
Sun: 9.30am - 2.30pm
  • Place inside your sleeping bag for extra warmth, or use as a stand alone bag in warm weather
  • Made of ultra-lightweight Thermolite fibre
  • Mummy shape with a box foot
  • Thermolite is a hollow-core fiber that provides extraordinary warmth for its weight and remains extremely breathable
  • It's very comfortable, more compact and warmer for its weight than fleece liners
  • Adds up to 8°C of warmth to a sleeping bag, or can be used on its own as the ideal warm-weather bag
  • Thin drawcord with tiny cord-lock around the hood
  • Very light and compact!
  • Packs into its own lightweight sack
Snowys Code:
Supplier Code:
Max. User Height:
210 cm
Internal Girth:
180 cm
External Dimensions:
210L x 90W cm
Packed Dimensions:
17L x 11W x 11H cm
0.248 Kg
Suggested Use:
Hiking | Trekking
Limited Lifetime
Staff tip:Just a heads up, this liner only comes in one size which is labelled as ‘short’
4.4 7
5 stars
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1 star
Feb 04 2018


Great to use as a sleeping bag when it's hot, and keeps you toasty inside your sleeping bag when it's cold out. I was skeptical but it works. And snowys is the place to buy it price wise.

- Melbourne
Jan 25 2018

Perfect for hot nights

Have used it once, and it was a very hot night. I started out using it as a top sheet just over my torso, and then as the temp dropped through the night, got inside of it. I love that it's so stretchy my legs can still move freely.

- Newcastle, NSW
Sep 10 2017

Takes the chill off

So far I've only used this bag once and was happy with it. It definitely takes the chill out of the air and provides additional warmth but I wouldn't bring a summer bag along in the winter and assume this liner would be enough.

- Marrickville
Nov 10 2016


This liner helps a bit, it is especially noticeable when you first climb in, no shivers like a plain bag. BUT is it capable of adding the stated degree rating to a bag? Who knows, it is a matter of how warmly you sleep, but with the sinch cord tightened down it sure helps.

- Emerald
Aug 23 2016

Great layer of extra warmth

I bought two of these, one for me and one for my husband. We used them in winter camping conditions with temperatures around 4 degrees. It is super soft and added a nice layer of warmth to the sleeping bags and we were both toasty. It is also very spacious and has a hood which fits nicely under the sleeping bag hood. Ours were black with blue trim

Mar 29 2016


Used it out bush as blanket when it got cold.havent used it as a liner, have to wait for winter. Felt like cashmere ,lovely to just wrap up in.

- Whyalla
Apr 29 2012

Handy Accessory

I have had one of these liners for about 5 years, and used it in countless scenarios in multiple seasons, and varying climates. It has travelled to Uganda and the Australian Outback as a stand alone sleeping bag, and has been to a Candadian, North American and New Zealand winter as a liner to my down sleeping bag. It is not only toasty warm, it is nice and stretchy for the restless sleeper.
My only complaint is it picks up hair, fur, prickles and grass quite easily so keep it off the ground


how tapered is the long liner1 answer

I don't want to be too raestricted when I insert into the liner insert around my feet. Will I regret ordering the tapered liner ?

- Adelaide(7 months ago)

G'day Bryan,

The Sea to Summit Thermolite Reactor Liner tapers about 10cm from the shoulders. The benefit of the liner is that the fabric is quite stretchy. While I can't speak for your opinion, common feedback is that the stretchy fabric makes the liner feel un-restrictive around the feet.

- Snowys(7 months ago)

Reactor Extreme?1 answer

Hi there, do you sell the Reactor Extreme liner as well? Thank you.

- Sydney(1 year ago)
G'day CH - We sure do. For some reason we haven't uploaded it online yet, but I see it has the Snowys code of #38184, and we do have a couple in stock (as of when I post this). To order one, give us a bell on 1300 914 007. Cheers, Paul
- Snowys(1 year ago)

It gets cold here, real cold.1 answer

Added to the roman mummy -5 deg sleeping bag, will it keep you warm and toasty in temps of around -8?

- BUNDARRA, NSW(1 year ago)
Hi again Ric. There are so many variables here that it's hard to say for sure. Not knowing exactly which sleeping bag you have, it's likely that the -5 rating is the lower limit, so the comfort rating is probably around +1 or +2. Even with this liner, on a -8 degree night I think it would still be too cold. It depends a lot on the person - whether you are a hot or cold sleeper. A good insulated sleeping mat will help a lot, and of course a set of thermals. For me personally, I would be getting a warmer sleeping bag if I was expecting those temperatures while camping. I hope this helps, please give us a call if you would like to discuss further. 1300 914 007.
- Snowys(1 year ago)

How do you wash it?1 answer

Is it drip dry. do you spin it out,?

- BUNDARRA, NSW(1 year ago)
Hi Ric, this liner is machine washable and will be fine for a normal spin cycle, but not suitable for the dryer.
- Snowys(1 year ago)
is initializing