Highlights
BEST USE: Thermal Boost
WEIGHT: 12.8oz | 364g
LENGTH: 78in | 198cm
PACKED SIZE: 5.9 x 3.0 x 4.7in | 15 x 7.5 x 12cm
Performance
- Ultralight
- Lightweight
- Midweight
- Ultra Compact
- Compact
- Midsize
- Warm
- Cold
- Extreme Cold
About The Product
As an essential component in your sleep system, the Reactor Extreme liner with Thermolite® Pro fabric using innovative infra red-absorbing ceramic pigments to give your system the thermal boost needed in colder-weather adventures. The soft, wicking stretch-knit fabric provides unmatched comfort and freedom of movement while still allowing the Reactor Extreme liner to fit any sleeping bag. Additionally, the drawcord footbox offers plenty of ventilation and the versatility of walking around camp while still wearing your liner if needed.
Product Features
- Thermal boost to retain heat and warmth, as the core of your sleep system the Reactor liner extends the performance of your sleeping bag and sleeping mat in the coldest of conditions
- Thermolite® Pro technology using knitted, hollow-core fibers and absorbing infrared ceramic pigments to reflect your body's heat back to the wearer for enhanced warmth and comfort
- Drawcord footbox can be opened or closed for optimal comfort and integrates perfectly with the footbox of our Free-Flow Zip system in select Sea to Summit sleeping bags
- HeiQ Fresh odour control technology helps keep the liner fresh even after extended use
- Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works seamlessly with sleeping bags of any shape
Shipping & Returns
We use climate-neutral shipping:
DHL GoGreen for orders to Germany, Austria and Czech Republic and
GLS Klima Protect for orders to Belgium, Denmark, France, Italy, the Netherlands, Luxembourg, Sweden, Switzerand and Norway.
All orders received by 12:00 noon on weekdays are usually shipped the same day. Orders received later are usually dispatched the following working day.
Delivery time can take up to 3 working days Germany-wide, 4 working days for orders to AT, BE, CZ, DK, FR, IT, LU, NL & SE and 6 working days for orders to CH & NO and depends on the shipping service provider.
Shipping cost:
- Germany, Austria & France: For orders with a value below 75€ we charge a shipping fee of 4,95€. We do not charge shipping fees for orders with a value over 75€.
- Belgium, Netherlands & Luxembourg: We charge a shipping fee of 9,99€ for all orders.
- Czech Republic & Italy: We charge a shipping fee of 14,99€ for all orders.
- Denmark: We charge a shipping fee of 75 DKK for all orders.
- Norway: We charge a shipping fee of 455 NOK for all orders.
- Sweden: We charge a shipping fee of 219 SEK for all orders.
- Switzerland: We charge a shipping fee of 29 CHF for all orders.
All orders can be returned within 14 days of purchase. However, for the sake of the environment, please make sure to keep returns as low as possible.
Find Locally

Reactor Extreme Sleeping Bag Liner Mummy Compact

- Thermal boost to retain heat and warmth, as the core of your sleep system the Reactor liner extends the performance of your sleeping bag and sleeping mat in the coldest of conditions
- Thermolite® Pro technology using knitted, hollow-core fibers and absorbing infrared ceramic pigments to reflect your body's heat back to the wearer for enhanced warmth and comfort
- Drawcord footbox can be opened or closed for optimal comfort and integrates perfectly with the footbox of our Free-Flow Zip system in select Sea to Summit sleeping bags
- HeiQ Fresh odour control technology helps keep the liner fresh even after extended use
- Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works seamlessly with sleeping bags of any shape
Technical Features

HeiQ Fresh

Thermolite Pro

Thermolite Ecomade
Tech specs
-
Comes WithStorage Case
-
Material(s)Thermolite® Pro & EcoMade Polyester
-
SpecialBio-based HeiQ Fresh Odor Control
Mummy Compact | Mummy | |
---|---|---|
Dimensions | 78 x 31.5 in 198 x 80 | 85 x 31.5 in 216 x 80 cm |
Packed Size | 5.9 x 3.0 x 4.7 in 15 x 7.5 x 12 cm | 5.9 x 3.0 x 4.7 in 15 x 7.5 x 12 |
Weight | 12.6oz 342g | 12.8oz 364g |