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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 | B0CT67SDHF |
| Additional Features | Thermal Boost, HeiQ Fresh Odor Control, Drawcord Footbox |
| Age Range Description | Adult |
| Best Sellers Rank | #7,712 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 | Drawstring |
| Color | dark blue or black |
| Customer Reviews | 4.6 out of 5 stars 49 Reviews |
| EU Spare Part Availability Duration | 7 years |
| Fabric Type | thermolite |
| Fill Material Type | Thermolite |
| Global Trade Identification Number | 09327868158355 |
| Item Dimensions L x W | 78"L x 31.5"W |
| Item Highlight | Insulated Thermolite sleeping bag liner adds warmth and improves hygiene in cold-weather camping |
| Item Weight | 0.41 kg |
| Manufacturer | Sea to Summit |
| Manufacturer Part Number | ASL031031-191902 |
| Material | thermolite |
| Maximum Height Recommendation | 85 inches |
| Model Number | ASL031031-191902 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Occupancy | 1 |
| Seasons | 3 Seasons |
| Shape | Mummy |
| ShellMaterial | thermolite |
| Size | 78 inches x 31.5" |
| Sport Type | Camping & Hiking, Backpacking, Hiking |
| Temperature Rating | 32F and above |
| Thermal Resistance | 32 |
| Unit Count | 1 Count |
Q**Q
Love this.
Love this. Adds warmth, still tiny.
P**Y
Worth every penny! Works very well on its own or in early spring or later fall!
This is a great investment! It is very soft and comfortable. There is plenty of room in the bag, even for a side sleeper. In cold weather this fits in my feather mummy sleeping bag and can actually become too hot at times. So this will help boost the warmth of that's what you are looking for. It's not too heavy for packing with other bulky winter gear. It also works well for early spring and fall by itself. The softness of the material makes this very cozy. Very quality materials that works for many different seasons.
L**T
Impressive
Item was as it was describe. Very nice!
W**N
It worked for me!
First night was in the 20’s f and worked great with my sleep system. I woke up to a small amount of snow and was warm without feeling drafts in my hammock. I use this every time in my sleep system
W**R
Sleeping bag liner.
Very happy with this quality liner. Definitely worth buying
S**E
Great fabric, broken zipper, questionable design
The fabric is great. light-weight, very warm and folds compact. One of the shoulder zippers came broken as shown in the 1st photo. I forced them together, and I leave it shut, as I am afraid it will easily break again if I use it. I'm not sure if I would ever find the shoulder zippers or the foot drawcord useful. If I'm hot, I can always unzip the sleeping bag and throw my arms out of the liner without unzipping the liner. When I'm hot, usually the torso is hot, not feet, and opening the footbox doesn't seem helpful. I'm not going to wear it outside the sleeping bag, like shown in the webpage photos. With my 5'4" height, I will drag this on the ground, and it will bring dirt into my sleeping bag later.
K**R
Nice
I bought this to use as a sort of sheet over a sleeping pad for a multi day trip in the Sierras where I used a few quits instead of a typical mummy bag. Worked great for this purpose, the liner has a very nice feel to it, much better than sleeping directly on a sleeping pad.
D**R
Nice fabric. Protects the bag.
The fabric is nice and it fits well inside the sleeping bag. It served my primary purpose which was to have a liner to protect my sleeping bag on a long outdoor trip and that I could wash later. However, I don’t know if it really added much warmth.
J**Y
Ottimo per le mezze stagioni
Usato per un paio di settimane con temperature da inizio autunno, per me che sono freddolosa è stato perfetto. Nelle notti più fresche l’ho abbinato a una coperta.
L**L
So cozy
Love it. Very cozy and the convenience of the the bottom drawstring and shoulder snaps are fantastic for popping out of the tent at night.
C**S
悪くはないがおすすめはしない
SeaToSummitの新型ライナー3つのうち、一番温かいモデル。 最初混乱したが、保温性はリアクターライナーが最低、リアクターエクストリームライナーが中間、リアクターフリースライナー(この製品)が最高ということになっている。最上位モデルにエクストリームと名付けるわけではないらしい。3つのうちで、この製品だけがThermolite®Proを使っていないので、商品説明にもこの製品だけ「身体が発する赤外線を吸収/反射する」という文言がない。ライナーで体の熱を反射しちゃったらシュラフに熱が伝わらないから結局寒いんじゃないの?という疑問は、とりあえずこの製品には関係ない。 シュラフの中でジップとコードを完全に締めると非常に温かい。何なら暑い。ところが肩や腕がライナーから出るようにすると途端に寒く感じる。試しにシュラフなしでライナーだけにくるまってみると外気に触れている部分が妙に寒く、一方でマットに触れている側は妙に暑い。 思うに、「内側(普通は人間の体)の熱をよく受け取る、自身の蓄熱性もそれなりに高い、外側(普通はシュラフ)にも自身の熱をよく渡す」ということではなかろうか。要するに単なるフリースだ。 正直、温度調整がピーキーでかなり難しいと感じた。 構造はジップやボタンなど結構複雑で、暗い中手探りで開け閉めしたり位置を整えるのが割とストレス。いっそ単なる巾着構造にしてくれと叫びたくなる。シュラフの中で微妙な寒暖に合わせて開放具合を調節・・・とかやってられない。 肌触りは悪くはないが、特に良いとも思わない。 身長170cmちょっとなので長さ198cmのコンパクトで十分かと思ったが少し足らなかった(なんでだ)。 コンパクトでも本体のみで403gあり、それほど軽いわけではない。ほとんど圧縮できないので量的にもかさばる。 手持ち寝具への温かさの追加を求めるなら、シュラフカバーか追加キルトが先で、それでも足りないと想定される時に初めてこのライナーの携行が選択肢に挙がると思う。 夏のシュラフ替わりという選択肢も提示されているが、わざわざこの重くてかさばって温度調整の難しい製品である必要はないと思う。
C**M
Kapuze zu klein
Super! Die Kapuze ist aber zu klein geraten, so dass man diese gar nicht richtig nutzen kann.
J**I
Very good quality
Very good quality
Trustpilot
2 weeks ago
4 days ago