Reactor Midweight Sleeping Bag Liner
SIZE
Reactor Midweight Sleeping Bag Liner
REG
1651 Chemin de l'Industrie
1651 Chemin de l'Industrie
Beloeil QC J3G 6S8
Canadá
Sea to Summit Reactor Midweight Sleeping Bag Liner
A thermal sleeping bag liner designed to boost warmth, improve comfort, and help keep your sleeping bag cleaner during repeated field or backcountry use.
Backpacking / Touring
Thermal Liner
Up to 6°C / 11°F
Thermolite® Pro
The Reactor Midweight is built with Thermolite® Pro fabric that uses hollow-core fibers and infrared-absorbing ceramic pigments to help trap and reflect body heat with minimal bulk.
Product Overview
Designed for backpacking, cycle touring, and paddle touring, the Reactor Midweight adds warmth to a sleep system while remaining relatively compact and easy to maintain. Sea to Summit states it can add up to 6°C / 11°F when paired with an appropriate sleeping bag and sleeping pad.
The liner also features stretch-knit construction, shaped arm openings for freer movement, a technical hood, HeiQ Fresh odor control, machine-washable construction, and snap connectors at the shoulders for compatibility with Sea to Summit sleeping bags that support integration.
Key Features
- Thermolite® Pro fabric for improved warmth retention
- Far infrared ceramic pigment technology
- Hollow-core fibers help trap body heat
- Stretch-knit construction for better sleeping comfort
- Shaped arm openings for unrestricted movement
- Technical hood for added warmth
- HeiQ Fresh odor control treatment
- Machine washable and quick drying
- Made with recycled fibers and bluesign APPROVED materials
Ideal Applications
- Cold-weather sleep system upgrades
- Backpacking and lightweight touring
- Cycle touring and paddle touring
- Keeping sleeping bags cleaner in the field
- Layered sleep systems for variable temperatures
- Users who want added warmth without carrying a heavier sleeping bag
Technical Specifications
| Specification | Regular | Long |
|---|---|---|
| Best Use | Backpacking, Cycle touring, Paddle touring | Backpacking, Cycle touring, Paddle touring |
| Type | Thermal Liner | Thermal Liner |
| Material | 100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester | 100% Post-Consumer Recycled Polyester; Stuff Sack: 100% Polyester |
| Weight | 12.3 oz / 350 g | 12.9 oz / 365 g |
| Dimensions | 76.0 x 31.5 in / 193 x 80 cm | 78.0 x 31.5 in / 198 x 80 cm |
| Packed Size | 4.5 x 7.5 x 4.5 in / 11.5 x 19 x 11.5 cm | 4.5 x 7.5 x 4.5 in / 11.5 x 19 x 11.5 cm |
| Fits Up To Height | 6 ft / 185 cm | 6 ft 6 in / 198 cm |
| Warmth Increase | Up to 6°C / 11°F | Up to 6°C / 11°F |
Why Choose the Reactor Midweight
This model sits in a practical middle ground: more thermal performance than a lightweight liner, but less bulk than heavier fleece-style options. Sea to Summit’s FAQ identifies the Reactor Fleeceweight as the warmest, followed by the Reactor Midweight, then the Reactor Lightweight.
For Fair D Canada, this makes it a strong fit for layered cold-weather sleep systems, expedition kits, winter camp setups, and customers wanting a simple way to extend the operating range of an existing sleeping bag.
