Reactor Fleece Mummy + Drawcord Sleeping Bag Liner
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Why We Like The Sea To Summit Reactor Fleece Mummy + Drawcord Sleeping Bag Liner
When we need a little extra warmth on cool fall camping trips, we pack the Sea To Summit Reactor Fleece Mummy + Drawcord Sleeping Bag Liner. The cozy liner gives us a 10% thermal boost to our 3-season sleeping bag, helping retain more heat while we camp at higher elevations. The drawcord design of the footbox allows us to customize our ventilation, offering extra breathability on milder nights and trapping heat when nighttime temperatures plummet.
Details
- Fleece sleeping bag liner for warmer nights in the backcountry
- Thermolite grid-fleece material increases heat retention
- Drawcord footbox opening gives us control over ventilation
- Mummy shape is designed to balance weight and comfort
- HeiQ Fresh odor treatment helps minimize foul smells
- Item #STSZ0A4
- Responsible Collection
- Recycled/Repurposed
- Material
- 60% Thermolite EcoMade (100% recycled polyester), 40% polyester, HeiQ Fresh anti-odor treatment
- Shape
- mummy
- Stuff Sack
- included
- Stuff Size
- 9.8 x 3.5 x 5.5in
- Dimensions
- [compact] 78 x 31.5in, [standard] 85 x 31.5in
- Claimed Weight
- [compact] 14.2oz, [standard] 15.5oz
- Activity
- hike & camp
- Manufacturer Warranty
- lifetime
Reviews
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Overall Rating
5 based on 13 ratings
Review Summary
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Selecting an option will reload the available reviews on the pageFebruary 9, 2025
We Survived -10°F in New Hampshire: Sea to Summit Fleece Liner Kept Us Warm!
[This review was collected as part of a promotion.] Our Boy Scouts of America troop braved the annual Klondike adventure in New Hampshire, facing temperatures as low as -10°F. Proper layering and quality gear were essential, and the Sea to Summit fleece liner proved to be a game-changer. Combined with a 15°F sleeping bag and a thermal liner, the fleece liner added a noticeable boost in warmth and comfort. It effectively trapped heat, prevented cold spots, and made a significant difference in overall insulation. The soft fleece material was cozy, and despite the extreme conditions, we woke up warm and well-rested. Highly recommend this for anyone looking to enhance their sleeping system in cold-weather camping.
Originally reviewed on Sea to Summit
November 8, 2024
Reactor Fleece Sleeping Bag Liner
[This review was collected as part of a promotion.] Great product. The perfect addition for my bag during this year backcountry hunt. Super light weight and adds tones of warmth and comfort to your sleep system. Two thumbs up.
Originally reviewed on Sea to Summit
July 1, 2024
Love this easy heat accessory!
[This review was collected as part of a promotion.] I absolutely love my Sea to summit camping supplies in reactor fleece, sleeping bag liner color orange mummy with drawcord. It keeps you warm in temperatures below 0°. It is so comfortable and yes, it really does. Keep you warm extremely warm. I would definitely recommend this product. I would definitely purchase this product again. 
Originally reviewed on influenster.com
June 10, 2024
Warm and comfy
[This review was collected as part of a promotion.] This fleece sleeping bag liner is nice. Used it this past weekend camping. The overnight temp was in the 40’s so not warm enough to use the liner by itself. On a hot summer day you might be able to. So I paired this with my sleeping bag and it felt like I was wrapped in a blanket. Nice and warm, but not too hot to the point I was sweating.
Originally reviewed on influenster.com
May 30, 2024
Great dual use bag
[This review was collected as part of a promotion.] This liner works great as a both a light summer bag and a liner bag in colder weather. Its compact and warm. I take it on both kayak touring and backpacking trips.
Originally reviewed on Sea to Summit
May 16, 2024
Warm and cozy
[This review was collected as part of a promotion.] Warm and cozy! This fleece liner is a little on the thin side but it’s still warm and I’m sure would pack a punch inside a sleeping bag! I’m using mine as a comfort item for when I feel overstimulated I’m able to cocoon myself and feel better after warming up and feeling safe in my “cocoon” lol
Originally reviewed on influenster.com
April 29, 2024
Best investment
[This review was collected as part of a promotion.] The Sea to Summit Reactor Fleece Sleeping Bag Liner is a fantastic product and a much needed one for camping. It provides extra warmth on chilly nights, extending the usability of sleeping bag into colder seasons. The fleece material is so soft and cozy. it’s lightweight and packs down making it easy to transport. I used it when I went camping last weekend and i will say , this will be a best investment for those who go camping. Love mine.
Originally reviewed on influenster.com
April 27, 2024
Highly satisfied
[This review was collected as part of a promotion.] 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 the trip. Turns out my favorite 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 bike-packing trip on warm nights
Originally reviewed on influenster.com
April 25, 2024
Great liner!
[This review was collected as part of a promotion.] Great compactable mummy liner! This is an waffle like texture and super warm for for insulating your sleeping bag. Very versatile for all sizes and have great cords to adjust size around head and feet. Perfect for backpacking and camping.
Originally reviewed on influenster.com
April 23, 2024
Reactor fleece sleeping bag liner
[This review was collected as part of a promotion.] The reactor fleece sleeping bag liner is very soft even though it’s not what I was expecting I figured it would be like a silky material but it was more like cotton but other than that it could fit like 2 people in it! And it definitely still keeps you warm! I would still recommend!
Originally reviewed on influenster.com
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