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🔥 Stay warm, fresh, and ready for every adventure!
The Sea to Summit Reactor Insulated Sleeping Bag Liner uses advanced Thermolite EcoMade fibers in a grid-pattern fleece to maximize warmth retention while maintaining lightweight comfort. Its mummy shape with adjustable drawcord footbox and shoulder zippers offers customizable temperature control. HeiQ Fresh odor control technology ensures long-lasting freshness, making it ideal for 3-season camping and backpacking. Compatible with select Sea to Summit sleeping bags and backed by a lifetime guarantee, this liner is a must-have for millennial professionals seeking reliable warmth and hygiene on the trail.












| ASIN | B0CT67MSSN |
| Additional Features | Lightweight |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Best Sellers Rank | #8,240 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Camping Sleeping Bag Liners |
| Brand | Sea to Summit |
| Brand Name | Sea to Summit |
| Closure Type | Drawcord |
| Color | Lime or Royal Blue |
| Customer Reviews | 4.8 out of 5 stars 54 Reviews |
| Fabric Type | thermolite |
| Fill Material Type | Thermolite hollow-core fibers |
| Global Trade Identification Number | 09327868158317 |
| Item Dimensions L x W | 85"L x 31.5"W |
| Item Highlight | Insulated Thermolite sleeping bag liner adds warmth and improves hygiene in cold-weather camping |
| Item Weight | 12.96 ounces |
| Manufacturer | Sea to Summit |
| Manufacturer Part Number | SS42100 |
| Material | thermolite |
| Maximum Height Recommendation | 7 feet |
| Model Number | SS42100 |
| Number of Items | 1 |
| Occupancy | 1 Person |
| Seasons | All Seasons |
| Shape | Mummy |
| ShellMaterial | thermolite |
| Size | Compact |
| Sport Type | Camping & Hiking |
| Unit Count | 1 count |
P**R
Would highly recommend for backpacking
Very satisfied with this purchase. Worth the price because it serves dual purposes so displaces other heavy gear in a backpack - camp blanket around the fire, sleep liner on chilly nights for extra warmth, and summer sleep sack for overnights in hot weather when you don't need a heavy bag.
K**H
I like it
Lightweight, warm, comfortable
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.
C**H
Great sleeping bag liner
Work super underneath my quilt to increase my art value.
B**.
Sleeping bag liner.
This bag liner is nice and warm. Drawstring bottom is great for sitting around the fire and keeping your legs warm. The snaps and hood helps keeps wrapped around you while you roll around at night. Was out for a cold evening and usually sleep in my puffy. Ended up taking it off in the middle of the night cause the liner was keeping me extra warm.
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.
C**6
Works great
Works great. My bag went from adequate to comfortable, with minimal weight added to my pack.
F**S
Good
Good
A**R
Fait d’un matériel assez mince
Camping d’automne Je m’attendais à ce que cela soit plus épais… Par contre je me suis sentie bien au chaud quand même.
D**T
contribuye a mantener calor
Es muy cómodo y efectivo para reducir la intensidad del frío
R**J
Super warm
Super warm und kuschelig, genau was ich wollte.
J**0
Sea to summit
Parfait, très bonne qualité
Trustpilot
1 month ago
2 months ago