Highlights
BEST USE: Thermal Boost
WEIGHT: 13.8oz | 390g
LENGTH: 78in | 198cm
PACKED SIZE: 9.8 x 3.5 x 5.5in | 25 x 9 x 14cm
Performance
- Ultralight
- Lightweight
- Midweight
- Ultra Compact
- Compact
- Midsize
- Warm
- Cold
- Extreme Cold
About The Product
The Reactor Fleece Liner built from hollow-core Thermolite® Pro fibers used in a grid-pattern to deliver our warmest sleeping bag liner and the core of any quality cold weather sleep system. You can regulate your temperature using the shoulder zippers and drawcord footbox, which also align perfectly with the Free-Flow Zip system of Sea to Summit sleeping bags. The versatile Reactor Fleece Liner delivers comfort across multiple seasons or can even be used as a stand-alone sleeping bag in warm weather. 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
- Hollow-core Thermolite® EcoMade fibers are used in a grid-pattern fleece for maximum warmth retention
- 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
- A mummy shape designed for maximum thermal efficiency and includes shoulder zippers and footbox drawcord for additional temperature regulation
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 Fleece 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
- Hollow-core Thermolite® EcoMade fibers are used in a grid-pattern fleece for maximum warmth retention
- 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
- A mummy shape designed for maximum thermal efficiency and includes shoulder zippers and footbox drawcord for additional temperature regulation
Technical Features

Thermolite Ecomade

HeiQ Fresh
Tech specs
-
Comes WithStorage Case
-
Material(s)Thermolite® EcoMade Polyester
-
SpecialBio-based HeiQ Fresh Odor Control
Mummy Compact | Mummy | |
---|---|---|
Dimensions | 78 x 31.5 in 198 x 80 cm | 85 x 31.5 in 216 x 80 cm |
Packed Size | 9.8 x 3.5 x 5.5 in 25 x 9 x 14 cm | 9.8 x 3.5 x 5.5 in 25 x 9 x 14 cm |
Weight | 13.8oz 390g | 14.8oz 420g |