Sea to Summit Thermolite Reactor Extreme – Sleeping Bag Liner and more

Sea to Summit Thermolite Reactor extreme


If you want to have a camping with light equipment, you can save money on your sleeping bag first.

In combination with some additional clothing, which is always present, the comfort area of the sleeping bag can still be pressed a whole bit. At some point, we can conclude that have two possibilities:

  1. Buy new warmer but still a lightweight sleeping bag.
  2. Buy a warm sleeping bag liner.

Since 1st choice comes to warmer light sleeping bags with considerable costs, the 2nd choice seemed always worth a consideration.

Recently, I had been looking for a suitable sleeping bag liner of Sea To Summit, which here produces the Thermolite Reactor series a whole series of differently warm liners. As the winter is coming, I asked the Bergzeit company to make a Thermolite Reactor Extreme available for testing. A few days later I had the Thermolite Reactor Extreme, let’s check the warmest sleeping bag liner.

390 grams of the Thermolite fabric weighing 110Gr / m² is now at my home and waiting for their first use. According to the product, specifications are up to 14 degrees extra drain.

It is nice that my kitchen scale does not work or the liner is somewhat lighter ?


Weight of Thermolite Reactor extreme

Weight of Thermolite Reactor extreme

Of course, you can then pull off the pack again, which you leave on tour eh at home.


Weight Packsack Thermolite Reactor Extreme

Weight Packsack Thermolite Reactor Extreme


If you are looking for sleeping bag liners, you can also find the company Cocoon on the Internet, which produces only liners.


Here, a comparable product is given as 9 degrees.

If the Thermolite Reactor Extreme would bring 10 degrees, I could be with my 3-seasons sleeping bag and a bit of clothing prima in the moderate winter.

Light, cheap and a small pack make the Reactor an attractive product when it brings performance.

Since the night temperatures in my house are still not sufficiently cold, I have to give a real test review.

I used the Reactor only indoor so far, which I liked but quite well comfortable. Freedom of movement is ensured above all because the fabric is even stretchable. Full of anticipation for the performance of the liner I exchanged my blanket in the bed against the Reactor. This has unfortunately not worked completely. Pure emotionally, it was as if I had put 200 bucks in mine pocket. The weave is not tight enough to prevent the potentially warm air between the liner and the body from volatilizing through body movements. As a liner, under a sleeping bag or windproof Bivy might look different, which is still to be tested.


Fabric of Thermolite Reactor Extreme

Fabric of Thermolite Reactor Extreme


I have a sleeping bag from Deuter, the Neosphere -10, for women means the -5-degree comfort range (and I’m convinced of it …)

In the Chilean summer, he was on an expedition to the Andes in 2015. Highest camp at 5.500m at -20 / -25 degrees.

First, of course, a good camping pad brings a huge advantage. (Thermarest NeoAir XTherm).

For the sleeping bag I have a Termolite Reactor with heat output 8 degrees (so not the warmest, thought me the second warmest must be enough). Since I was really a frightened in the night to freeze, then still a light down jacket, a second light to the legs and my mittens over the feet (fit not quite, but for the toes is enough). To do this, a towel on the head, one on the neck, liner gloves for the fingers and the whole with long underwear I always eh. prepared for the night.

I must say I’ve never had such a restful and deep sleep like that up there! Some colleagues of mine have had their -25 degrees sleeping bags, but rather simple sleeping mats. They did not have frozen but also had no great sleep. I think I did everything right and saved a lot of weight … everything I had in my sleeping bag, I had to have eh.

Conclusion: If you do not want to afford two sleeping bags is with such a liner quite well!
Of course, I also use the liner for any huts – is my only hut sack.

Here again the facts before in the next weeks here still a praxistest follows

Length: 210cm

Width: above 90 cm, lower narrow (not measured) because mummy shape.

Weight: 399 grams Manufacturer’s data, 358 grams of re-weighed (15 grams of packsack)

Temperature gain: according to manufacturer up to 14 degrees, practice test follows

Material: 110g / m² Thermolite (100% Polyester)



Why Use A Sleeping Bag Liner

A lining for sleeping bag serves two main purposes: keep you warm and keep your sleeping bag clean.

Sleeping bag liners are perhaps the undervalued items in the world of the camping. Lightweight and extremely packable, they add precious heat to your bag and play a valuable role in hygiene.


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What is a sleeping bag lining?

If you already have a sleeping bag or linen provided by a hotel/hostel, then why I use a sleeping bag? What does a sleeping bag line do?

A lining for sleeping bag serves two main purposes: keep you warm and keep your sleeping bag clean. However, the design of the lining of the sleeping bag will result in an adaptation more or less adapted to one or both of these purposes.

Can you use a sleeping bag liner as opposed to a sleeping bag? It depends on the weather of the place you could use it.  Usually, we recommend it as the nights can sometimes be not cold.

Learning how to use a sleeping bag liner is super simple – depending on its purpose and design, it slips inside the sleeping bag as a mummy bag, or placed in the sheets of a bed as an extra layer. ..


Why we need a sleeping bag liner?

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To put the value of sleeper liners into context, ask yourself this question: you slept in a bed without bed liner or a duvet for several nights, even weeks in a row? Probably Not The majority of sleeping bag users sleep twelve times before washing in the bags, despite the obvious sources of contamination that you and your sleeping bag are subjected to while travelling or hiking: mud, sweat, condensation, drinks spills, insect crushing. the list goes on. If one thinks of sleeping bags in this light, the case becomes clear for the use of a sleeping bag liner. With an easily removable and easily washable barrier between you and your sleeping bag, sleeping bag linings solve the hygiene problem and much more.

Once you have tried to sleep with a feed, you will appreciate the extra comfort they offer and the ease with which they can be removed and washed compared to a full sleeping bag. Come winter time, you also benefit from the extra heat of 2 ° C that a good quality package can be delivered on average. In summer, sleeping bags can even be used as the ultimate sleeping bag when it is too hot to use a full sleeping bag. Perfect for warm summer nights and travelling in tropical/subtropical regions.

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Basically, liners are used in two applications – one, inside a sleeping bag and two, as travel sheets.

Protect your sleeping bagUsing a liner will keep your bag cleaner, which will mean washing it less often. It’s easy to come home from a backpacking trip and throw the liner into the washing machine (much easier than washing a sleeping bag). Your sleeping bag doesn’t have to smell like a student dorm room, and the oils from your skin don’t have to migrate into the insulation.  When it comes to camping, it’s not all about the sleeping bag; the smaller details matter too. It’s a good idea to care for your valuable sleeping bag, and for yourself, with a practical and versatile sleeping bag liner!

To sum-up the uses of a sleeping bag liner:

– To use in warm climates instead of a sleeping bag or sheets

– To help protect against biting insects

– To increase the warmth of a sleeping bag

– To protect the inside of a sleeping bag from dirt: easily washable

– To use in overseas hotels or hostels, protecting against potentially contaminated sheets

– To increase next-to-skin comfort, aid relaxation, and a good night’s sleep

Change your sleep environment: Using a liner in a sleeping bag will add warmth – even the silk, silk/cotton, Adaptor or Expander models trap an extra layer of air; the hollow-core Thermolite™ Reactors trap a lot more.


Which sleeping bag liner suit for me?

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  • Type – the two main type of sleeping bag liners are mummy bag liners and rectangular liners. Mummy bag liners are great for fitting inside a sleeping bag and keeping you snug, whereas rectangular shaped liners are generally better for beds and for moving about.


  • Material – sleeping bag liners come in many different materials, some of the most common being cottonsilk, microfiber and polyester. Microfiber is generally the bulkiest of these and while polyester can be the cheapest, it can also be less comfortable on the skin. The best silk sleeping bag liner can be quite expensive but luxuriously comfortable.
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  • 1. Silk Liners are the lightest and most compact; they wick moisture well and dry quickly. Ideal (in mummy form) for backpacking or (as a Traveler) for hostel/budget hotel use. Sea to Summit’s Silk Sleeping bag Liners is now equipped with an exclusive Comfort Stretch Panel – a stretch panel which runs the length of the side seam and provides a greater level of comfort than has previously been possible in a silk liner. Also available as a double-wide version.


  • 2. Highly cost-effective solutions which, though not as light or packable as silk, still offer impressive weight and pack size. Cotton is a natural fibre known which delivers warmth and excellent comfort against the skin. Poly Cotton is a Polyester/Cotton blend, which combines the comfort of cotton with the strength and light weight of the polyester. Cotton liners weigh in at between 300 and 400 grams, whilst Poly Cotton liners come in at around the 300-gram mark. As with silk, both are quick and easy to wash and dry.


  • Warmth – do sleeping bag liners keep you warmer? Well, not all sleeping bag liners are designed to provide additional warmth and some materials do this better than others. Thermal liners are the warmest sleeping bag liner and are usually made of polyester. Microfiber liners can add considerable comfort but modest warmth.


  • Size – if you’re travelling you will want to save space. The most lightweight sleeping bag liner is usually made of silk or polyester. However, do note that most liners can be stored compactly and do not take up too much space at all, regardless of their material.


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How to care for your sleeping bag liner:

This is the easy part. All of our liners are machine washable using standard laundry detergent. If you’re using a top-loader machine, it’s worth putting the liner in a pillowcase to stop the drawcord getting tangled in the impeller (the spiral plastic device at the centre of the drum). Just make sure to keep fabric softeners away from your liner – the softener will reduce the wicking performance. Air-drying is best, there’s no need to put a liner in a dryer.