







🔥 Elevate your sleep game — stay warmer, lighter, and greener on every trek!
The Sea to Summit Reactor Extreme insulated sleeping bag liner uses advanced Thermolite Pro fabric with infrared technology to boost warmth by up to 25°F. Made from 50% recycled materials, it offers eco-friendly insulation without sacrificing performance. Designed in a technical mummy shape with a drawstring hood, it fits snugly inside your sleeping bag or can be used alone in warmer conditions. Lightweight at 386g and easily packable, it’s ideal for backpackers and winter campers seeking versatile, sustainable warmth.




| Age range | Adult |
| Color | Orange |
| Size | Standard |
| Style | Extreme Standard (85 x 31.5) |
| Insulation material | Thermolite |
| Item display length | 85 inches |
| Weight | 386 g |
| Item display width | 31.5 inches |
| Shape | Mummy |
| Material type | Thermolite |
| Maximum height recommendation | 7.08 Feet |
| Outer material | thermolite |
| Seasons | All Seasons |
| Features | Drawcord Footbox |
| Sport | Backpacking, Camping, Hiking |
| Batteries included? | No |
| Brand | Sea to Summit |
| Fill material | Thermolite |
| Manufacturer | Sea to Summit |
| Item model number | ASL031071-190804 |
| Product Dimensions | 21.5 x 15 x 7.5 cm; 380 g |
| ASIN | B0CT69SWJP |
I**N
Great
Great item, thank you.
J**E
So warm and so perfect.
Because my house is awaiting insulating, I sleep in mine daily and its so warm and perfect. Breathes well too.
A**A
Used it with a 3 season sleeping bag in -8 Celsius.
It worked very well. I had a 3 season sleeping bag and this liner. Temps dropped to -8 Celsius in the mountains but I slept very well indeed.
P**N
A must buy for cold sleepers with mediocal sleeping bag
So nice... really makes a difference! Anytime again
A**I
Way too overpriced!!!!
Much greater alternative to other sleeping bag liners which actually working and make a difference on temperature ratings...also pretty comfortable and nice feeling. Although is a good product after trying many other cheaper products I founded that is way to overpriced comparing with many other which performed as well
H**O
So comfy
Really nice quality, kept me warm when camping in Scotland.
Trustpilot
1 month ago
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