Sea to Summit Thermolite Reactor Extreme Sleeping Bag Liner - Red, 90 x 210 Centimeter
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At a glance
- Condition
- New
- Style
- Extreme (83 X 35)
- Weight
- 14.08 oz
- Color
- Red
- Material
- thermolite
- Shape
- Mummy
- Seasons
- Evergreen
Features 7
- thermolite
- Imported
- Insulated sleeping bag liner adds extra warmth and personal hygiene to any sleeping bag
- Reactor Extreme features heavier weight Thermolite throughout and adds up to 25F degrees
- Thermolite hollow core insulation is lightweight, soft and comfortable with stretch knit construction
- Mummy shaped with toe-box, draw cord hood and included stuff sack
- Extreme (M) Dimensions 83 x 35-inches; packed size 6.5 x 4.5-inches; weight 14oz
Description
Sea to Summit Reactor series insulated sleeping bag liners can extend the comfort range and improve personal hygiene of any sleeping bag. Thermolite hollow core fibers are constructed like the fur of a polar bear, efficiently trapping heat and providing a luxuriously soft, comfortable feel. The stretch- knit fabric provides optimal comfort, and ensures the Reactor fits any sleeping bag. Additionally, the drawcord footbox offers plenty of ventilation and the versatility of walking around camp while still wearing your liner. Available in three different weights, Reactor technical liners make your existing sleeping bag warmer and more versatile. The Regular Liner uses hollow-core Thermolite Pro fabric with infra red-absorbing ceramic pigments and Thermolite EcoMade fibers. This lightweight fabric adds up to 14F of warmth to your sleep system. The Extreme Liner features a thicker hollow-core Thermolite Pro fabric to add up to 25F of warmth to your sleep system. The Fleece Liner employs hollow-core Thermolite Pro fibers in a grid-pattern to deliver our warmest sleeping bag liner which adds up to 32F of warmth to your sleep system.
Specs 28
| Brand | Sea to Summit |
|---|---|
| Color | Red |
| Occupancy | 1 |
| Shape | Mummy |
| Seasons | Evergreen |
| Temperature Rating | Extreme |
| Age Range (Description) | Adult |
| Sport | Camping & Hiking |
| Special Feature | Reactor Extreme |
| Material | thermolite |
| Sport Type | Camping & Hiking |
| Additional Features | Reactor Extreme |
| Closure Type | Zipper |
| Maximum Height Recommendation | 210 centimeters |
| Fill Material Type | Thermolite |
| ShellMaterial | Nylon |
| Fabric Type | thermolite |
| Brand Name | Sea to Summit |
| Age Range Description | Adult |
| Global Trade Identification Number | 04 |
| Number of Items | 1 |
| Item Type Name | Sea To Summit Thermolite Reactor Extreme Sleeping Bag Liner - Red, 90 x 120 cm |
| Model Number | AREACTEX |
| Manufacturer | Sea to Summit |
| Manufacturer Part Number | AREACTOREXT |
| Item Dimensions L x W | 83"L x 35"W |
| Item Weight | 14.08 ounces |
| Size | 90 x 120 cm cm |
No specs match.
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Top Amazon Reviews
Perfect for my needs
Style: Extreme (83 X 35)
This is a perfect addition to your kit. It’s lightweight and adds a lot of warmth to your sleeping setup. It was a cost effective way to stretch the usefulness of my sleeping bag! It was comfortable and easy to add/remove to clean.
Reviewed in the United States on August 11, 2026 by Ronald Simpson
Money Well Spent
Style: Extreme (83 X 35)
This SeatoSummit product performs very well, and may be the best money I've spent as I figure out products that work well for me. I'm 6' 2.5" inches tall/260 lbs, camp 10-12 times per year, and have been trying to survive colder temps by augmenting my Army patrol bag that is part of the original "sleep system". It is rated for 30 degrees survival. I use an R7 rated sleep pad from Costco with the bag and this liner. The patrol bag is about two inches too short for me to have over my head with any flexibility, so I really feel the cold around my shoulders when the liner slips off my shoulders below my chest. When I wake up from the chill and pull the liner back up to my neck, it's instant warmth,...an easy extra 10 degrees in heat retention. The only improvement I could recommend is perhaps a more robust draw string for when you get into the liner, so that is doesn't slip down if you toss in your sleep.
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Reviewed in the United States on July 9, 2023 by R. Cooper
Worked Very Well. Noticeably Warmer
Style: Extreme (83 X 35)
I really appreciated this liner as the temp fell from 20 degrees to 3 degrees overnight this weekend in the Catskills. Normally I would be very uncomfortable in my 15 degree bag at these temps, but the liner made it noticeably warmer. One of the reasons is that is eliminated the natural cold spots you get in a bag when not occupied by your body while you sleep, so when you shift you normally feel the cold. With the liner, which was snugly wrapped all around my entire body all night, I slept very well with no cold spots. It is big enough to provide room to shift positions but stays with you all night. Is this liner (or any liner for that matter) perfect for every sleeper? Of course not, but with the right layering and a halfway decent bag it really does make a difference and keeps the bag much cleaner. Small and easy to pack. I will be taking this with my on all cold weather situations. My recommendation is give it a try and see if it works for you. Cold weather sleeping is all about finding a layering system that works for you. This is a great additional layer that worked very well for me.
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Reviewed in the United States on January 23, 2013 by MPKNYC
Adds warmth
Style: Extreme (83 X 35)
I was skeptical after first receiving this product. It is a stretchy, rather thin weave and I simply could not believe it would add warmth to my bag. So last night I slept outside in our open carport. My bag is rated at 30 degrees (which is a stretch). It was quite windy and dropped down to 27 degrees. I wore a light base layer and wool socks. In the middle of the night I woke up because my feet were too hot and had to remove my socks! My face was the only part of my body exposed to the outside but when I pulled the liner over my face I felt so much warmer. I found it rather easy to get into it and it was certainly not restrictive to sleep in. I'll be glad to have it along on my hike.
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Reviewed in the United States on March 4, 2019 by Gus Jones
VERY SPENDY: Fills a unique and important niche.
Style: Extreme (83 X 35)
I paid such a ridiculously high price for this product that I am too ashamed and embarassed to admit it, to you. I did, however, decide to purchase it, anyway, despite the high premium. Here is why ... So, I have constructed a lightweight 3-season system, for Central Texas, which does get "very" cold, at unpredictable intervals, throughout the late-fall to early-spring "trimester". Central Texas is Hill-Country ... Lots of steep ridges and canyons, all bunched together and there is lots of climbing involved and major weather fronts converge, in this region, manifesting all sorts of conditions, sporadically and unpredictably. My sleep-system consists of ONE G.I. Gortex Bivy-Bag and one SnugPak compact and lightweight "JUNGLE" bag (with integral bug-net), ... In order to augment this basic system, I also carry a VERY light and VERY compact Adventure Medical ThermoLite 2.0 Reflective Emergency Bivy AND ... YES ... This (equally ultra-light and compact) ThermoLite Reactor Extreme Mummy Liner. In colder weather, I may carry an additional silk or fleece bag liner. *** COST JUSTIFICATION *** These augmentation components fit in your open hand, and are smaller than a standdard roll of toilet-paper (and are a little lighter.) This allows for a very light, compact, and highly mobile and flexible sleep system that can "stretch" your temperature tolerance by (very hopefully) 25 to 30 degrees, F. I also carry a Short RidgeRest (aluminized) closed-cell pad, which is shorter and narrower than most pads. To be honest, I do not believe that these (ThermoLite) ultralight options perform to their optimistic claims, of 15 degrees for the thermal bivy and 25 degrees for the Reactor-Extreme bag liner ... Again, used together, properly, ?? ... 30 degrees of boost is the most one could hope for, and is probably overly optimistic ... I would expect to get slightly better than 20 degrees using BOTH thermalite components, if the temps were below freezing. Anything that weighs less than a roll of toilet-paper and is smaller, that can boost my sleep comfort (and survival envelope) by ANY significant amount MUST be worth spending a bit "more". ... And ... I sure DID ! Sorry ... no anecdotal gripes, as of yet ... I try not to use this resource any more than necessary. If I KNOW ... IN ADVANCE ... That it will be cold, then I will pack my USGI-ECWS-IMSS which is 12 pounds and will handle anything Texas can throw at me (any time). Hope this helps.
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Reviewed in the United States on June 3, 2012 by Studio Gear Head
Pleased with the item but…
Style: Extreme (83 X 35)
Really satisfied with the feel of the material, the durability, and effectiveness of the bag liner. I got the extreme version because I wanted to be able to pair it with my 20° bag and get more range and extend its life. I also planned to use the bag liner as a hot summer night sleeping bag. It’s also much easier to wash than a sleeping bag. So it’s nice to use on trip you might be rolling a little grubby. Turns out my favorites use for it is as a summer bag. It’s very small when packed compared to a sleeping bag and works well to keep you comfortable on a backpacking or bikepacking trip on warm nights. It also works well as a bag protector with added warmth to my -20° winter bag. Allowing you to sleep without base layers if that’s your thing. It does not however extended the range of my 20° bag. So if you’re thinking to buy this to push your 20-30° bag to a 0° then I suggest putting them money towards a proper 0° instead. Sleeping outside in zero degrees is really cold and while this helps a bit, it doesn’t make up for the right gear for the job.
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Reviewed in the United States on April 23, 2023 by Amazon Customer
Worth the purchase
Style: Extreme (83 X 35)
Tested this with my Phoenix two-stage sleeping back 3 years ago, while camping in November. I not carry this as my "improvised sleeping bag" for summer and spring camping. Before using the item: Very cold, unable to sleep After applying the item: Nice and toasty. My sleeping bag is two-stage, meaning it is essentially two sleeping bags one inside the other. I have applied this liner to the outside of the inner sleeping back, so inside the outer bag. It seemed to definitely improve the temperature by at least 10 degrees. At 5am in the middle of the woods I didn't bother bringing a thermometer to check the actual temperature, but it was enough of a difference to change miserable night experience into comfortable sleep.
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Reviewed in the United States on February 12, 2018 by Wulfgang
Awesome lightweight blanket
Style: Extreme (83 X 35)
I bought this for Everest Base Camp trip and I used this every night. Our guiding company gave me a sleeping bag but I felt more comfortable getting into this liner first and then the sleeping bag. This liner definitely added more warmth. I also used it later during our camper van trip in New Zealand on chilly nights.
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Reviewed in the United States on February 23, 2025 by Viswa Viswanathan