Sea to Summit Reactor Insulated Sleeping Bag Liner
Details
- BrandSea to Summit
- ColorOrange
- Occupancy1
- ShapeMummy
- Seasons3 Seasons or
- Temperature RatingUp to 25F in
Description
🔥 Elevate your sleep game with warmth that moves with you!
- FREEDOM TO MOVE - Knitted hollow-core fabric stretches with your body, ensuring unrestricted comfort all night.
- LIFETIME CONFIDENCE - Backed by Sea to Summit’s lifetime guarantee—your trusted companion for every season and trek.
- FRESHNESS THAT LASTS - HeiQ Fresh technology keeps odors at bay, so your liner stays clean even after extended adventures.
- STAY TOASTY ANYWHERE - Thermolite Pro fibers reflect your body heat for a cozy +25°F warmth increase.
- CUSTOM COMFORT FOOTBOX - Drawcord footbox lets you adjust ventilation or seal in heat, perfectly syncing with Sea to Summit’s Free-Flow Zip system.
The Sea to Summit Reactor Insulated Sleeping Bag Liner uses advanced Thermolite Pro technology with hollow-core fibers and infrared ceramic pigments to reflect body heat, boosting your sleeping bag’s warmth by up to 25°F. Its stretchy knitted fabric offers superior freedom of movement, while the adjustable drawcord footbox enhances comfort and ventilation. HeiQ Fresh odor control keeps the liner hygienic during extended use. Designed for 3-season or winter backpacking, this mummy-shaped liner fits up to 7’1” tall users and comes with a lifetime guarantee, making it an essential upgrade for serious outdoor enthusiasts.
Specifications
| Brand | Sea to Summit |
| Color | Orange |
| Occupancy | 1 |
| Shape | Mummy |
| Seasons | 3 Seasons or Winter |
| Temperature Rating | Up to 25F increase in sleeping bag warmth |
| Age Range (Description) | Adult |
| Sport | Backpacking, Camping, Hiking |
| Special Feature | Drawcord Footbox |
| Material | Thermolite |
| Fill Material | Thermolite |
| Product Dimensions | 33.46"L x 12.4"W |
| Closure Type | Drawcord |
| Outer Material | thermolite |
| Fabric Type | thermolite |
| Maximum Height Recommendation | 7.08 Feet |
| Item Package Dimensions L x W x H | 7.52 x 4.88 x 4.17 inches |
| Package Weight | 0.38 Kilograms |
| Item Dimensions LxWxH | 8.46 x 5.91 x 2.95 inches |
| Brand Name | Sea to Summit |
| Country of Origin | China |
| Manufacturer | Sea to Summit |
| Part Number | ASL031071-190804 |
| Style | Extreme Standard (85 X 31.5) |
| Fill Material Type | Thermolite |
Reviews
O**M
Kept me too warm. almost
I took this mummy system on a trip to Maine on an overnight in temperatures in the single digits and teens. I was so warm, I had to unzip my sleeping system to let out some heat in the night. I am very happy with the quality of this sleeping system.
M**K
Stay warm and cozy!
These really add extra warmth to your sleeping setup out in the back country. It's very light and compact when stored away. The liner is super comfortable on your skin and doesnt feel weird at all.
R**Y
Amazing. Must have.
An absolute must for campers. It is insanely comfortable and warm. I am wearing as I write this review. I was shivering in camp last night under my down blanket. I woke up and put this bad boy on and slept like a babe the rest of the night. Love it. I have the breeze one for summer as well.
B**.
Not sure how much difference it makes
I'm pretty skinny. 6'4" and 180lbs. I'm always cold at night. I got this, and I was still pretty cold. Maybe it took the edge off, but I'm not sure how much of a difference it makes. I'll keep using it though.
T**Y
Works as it should. Easy to wash.
So pleased with this purchase! I used it every night on a 10 day backpacking trip and it was great! It was an effective barrier from the nylon sleeping bag, so I didn’t stick to it and it was easy to clean when I got home.Also, it’s been great on other warm weather campouts when a sleeping bag would have been too hot.I think it’s definitely worth the spend!
D**C
Extra warmth for minimal weight
I used this during a recent 3 day competition where we had to carry all of our gear and camp outside. Winter storm was predicted so I got this to bolster my sleeping bag. It got down into the teens and we had 5”+ of snow one night. This definitely helped keep me warm, especially sleeping on an ultralight foam pad.Packs down small and doesn’t weigh too much for the warmth it provides.Probably way overpriced for what it is (someone with basic sewing skills could probably make this for half the price), but if you need some extra insulation that doesn’t get too much in the way of sleeping, this is a good purchase.
J**Y
Keep you warmer
Added at least 10 degrees to my sleeping bag and only added a little extra weight
D**T
Fan-freakin-tastic!
Did not expect to like this thing since I have restless less and claustrophobia... BUT this is a wonderful piece of gear for my cooler backpacking trips.I have a sierra cloud10 down sleeping bag comfort to 25F, but we headed out for early Nov trip in upstate NY/CT border... temps down to upper 20s so didn't want to risk it. The liner didn't tangle around my legs, nice drawstring around my head and arm holes for functional access. Nice and toasty!!! Liner also served double duty as a leg warmer/blanket while making breakfast on a cold morning.Was skeptical at first, but so glad I bought this thing. Worth the extra ounces in the backpack!!
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