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Sea to Summit Reactor Thermolite Liner

Read All 23 Reviews

Item No. 521144

The Sea to Summit Reactor Thermolite Sleeping Bag Liner. Our best selling sleeping bag liner! The Reactor is made from 80 gram/m2 Thermolite the lightest weight Thermolite available. Thermolite is a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Adds up to 14° F of warmth to a sleeping bag or, used alone, is the ideal warm weather bag.

DECENT FEATURES of the Sea to Summit Reactor Thermolite Liner

Lighter weight, more packable than fleece
Mummy shape with a box foot
Draw cord hood with mini cord lock
Contrasting color along the top edge makes it easier to find the opening
Packs into its own Ultra-Sil stuff sack

The SPECS

Extra Warmth: Up to 15° F / 8.5° C
Weight: 8.7 oz / 248 g
Length: 7' / 210 cm

This product can only be shipped within the United States. Please don't hate us.

Custy Reviews

for the Sea to Summit Reactor Thermolite Liner

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(based on 23 reviews)

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"Great liner, but not as warm as stated" 04/20/13

Bought this to bump a 32 degree bag to a 20 and it barely adds 5-10 degrees to your bag. Would probably rather go for the Thermolite Reactor Plus if warmth is the factor. Ratings aside, it is a super comfortable and useful bag that goes everywhere with me when traveling. Great for hostels or just crashing on a friend's couch.

by Timothy from Florida

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"Essential" 02/13/13

This is a great product. Slept in a 15 degree bag with this item in 25 degree weather. Kept me very warm and also allow me to move around easily in my mummy bag. It takes up very littel room and makes the bag much more confortable - feels like a very light weight flannel (versus a the nylon feel of the bag). HIghly recommneded.

by Mark

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"Good cover-up" 10/21/12

This liner is nice to travel with, because it keeps my sleeping bag cleaner and keeps me covered up when i just want my bag unzipped for warm weather. However, most mornings I wake up to find it in a bunch at my feet. Maybe I just sleep a little crazy? The other thing that bothers me is that the material is a tiny bit "snaggy" on my skin. I have dry, calloused hands and feet, which catch/snag on a lot of materials. This stuff isn't too snaggy, but its not great either. It feels nice on the rest of my body. I think it might not be worth the retail price. I found a used one for cheap so it works for me.

by Sylvie from Santa Cruz, CA

ACONCAGUA STATUS

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"Its just OK" 12/30/11

I have used this liner for more then three years with my 20 degree bad on many cold nights in the field. Im not sure about the whole 'thermolite" deal, it really doesnt add that much warmth. Its okay but there could be better/cheaper options out there depending on your needs. If your winter camping its probably not the bag for you. Its not all bad though! Its keeps your bag clean, it is super lightweight, and the material feels nice! If nothing else its a comfort for me to have it and I wont sleep in my bag without it.

by Andrea from Planet Earth

ACONCAGUA STATUS

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"decent sleeping bag liner" 12/19/11

I've owned this exact liner before. It doesn't really increase the warmth by as much as it says it does on the package. However, it's perfect for hotter places where you want mosquito protection, but you don't want to have to get in your bag. It's also good for cold nights with your bag. Again, I don't think it gives you as much warmth as advertised, but it gives you a little extra. It's also good for when you are borrowing (or loaning out) a sleeping bag so you don't have to sleep in someone else's gross bag.

by Andrew

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"It's a liner, but it has shenanigans" 04/11/11

I don't know what "up to 14 degrees" means. Either it is or it isn't 14 degrees, I don't like these mind games. But it did keep me warm-ish. I slept in a 15 degree bag that is definitely a 15, and it got down to 8, and I didn't die with this thing. It sucked, but it was decently livable. It's not a godsend, but it's a useful tool if you misjudged weather. Also makes a good hot hot hot weather bag, it is pretty soft and comfy

by Matthew

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"-10 degrees but I was warm" 01/21/11

I bought this for a recent Mt Washington summit over MLK weekend. At our shelters, it got down to -15F. I used this, my zero degree marmot bag, and layers. It worked well. It was also nice because it has a good blankety feel, that can help coax you to sleep in cold environments!

by Kelsey from Ohio

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"top liner above all." 01/06/11

Kept me warm at night and at the same time. Left condensation out of my bag which I hate the feeling. You would be happy with this product, and its a steal for $40 bucks. It also keeps your bag cleaner... leaving you to only wash this liner itself. Protects the bag from your body oil (sebum, from follicles) dirt, etc.. I strongly believe this is worth it. Ok truthfully I wouldnt say that this reactor along reduced the temp by 15-20 degrees F. IMHO: lol It really depends on how you sleep and what you had for dinner. How cold you are etc.At most 5-10 degrees max. w/e

by ALAN from NEW YORK

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"Good S**T!!!!" 06/12/10

Pair it with my 30 degree down bag in the winter and keeps me warm through the night, and I can leave the sleeping bag at home in the summer and just sleep in the liner. Using the shit out of it and it packs down small, is light, and easy to keep clean.

by Justin from SW Missouri

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"It's see-through" 03/30/10

I wanted a smaller, warmer, faster drying, more high quality liner than the ones I had been using as a professional guide. I figurd this liner would actually add 15 degrees (as the packaging said)... I'd venture a guess to say it added maybe 5 degrees of warmth. You can see through the liner and common sense would dictate that this is not as warm as it's made out to be. I'm going to return this and go with a cotton liner that's 1/3 the price of this rip-off.

by Brian from Bascom Hall

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"Good product, but not worth the money" 02/04/10

This is rated to allow an extra 15 degree protection to your sleeping bag. I would say 7 degrees instead. For the price I would reccommend going for the next level Sea to Summit bag liner which offers up to 20 or 25 degrees. I'm gonna exchange for the 25 degree version instead.

by MATTHEW from HAMPTON

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"awesome liner" 01/20/10

I don't know about added warmth but it definitely keeps the bag clean. highly recommended

by Vartan from Los Angeles County

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