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A lightweight liner that adds warmth and comfort to your sleep system
Sea to Summit says:
The go-to liner for every adventure.
Regardless of sleeping position or tossing and turning, the stretch knit construction and armholes provide complete freedom of movement, allowing unrestricted rest. It fits into any sleeping bag and snaps into Sea to Summit bags for easier entry and exit. Using Far Infrared Technology (FIR) and hollow-core fibres, Thermolite Pro traps and reflects body heat, increasing warmth without adding significant weight and bulk. The Reactor Lightweight may add up to 4°C | 7°F when used as part of a sleep system.
Unlike sleeping bags, the Reactor Midweight Liner is easy to clean and quick-drying. And its HeiQ Fresh odour control treatment keeps it fresh throughout extended use. Frequent washing can reduce the performance of your sleeping bag. Using a Reactor Liner reduces the need for frequent washing, helping maintain the sleeping bag's loft and extend its useable life. Frequent washing can reduce the performance of your sleeping bag. Using a Reactor Liner reduces the need for frequent washing, helping maintain the sleeping bag's loft and extend its useable life.
Our Verdict
At 261g (Medium), this is a simple way to add a bit of warmth without changing your main setup. The stretch fabric feels comfortable and moves easily inside a sleeping bag, avoiding the restrictive feel of older liners. It adds a small boost in cooler conditions and helps manage moisture overnight. It also keeps your sleeping bag cleaner, which is useful on longer trips. The pack size is small, and it dries quickly. It suits extending a three-season setup rather than replacing a warmer bag.
- Reviewed by Ultralight Outdoor Gear
Features
- Arm openings with snap closures
- Stretch knit fabric is supremely comfortable
- Technical hood and Free Flow compatible arm holes create increased precticality
- Knitted fabric offers significant stretch, pairing with any sleeping bag
Specifications
Short
- Weight: 241g
- Max Use Height: 170cm
Medium
- Weight: 261g
- Max Use Height: 185cm
Long
- Weight: 277g
- Max Use Height: 198cm
Material & Construction
- Thermolite Ecomade
- Thermolite Pro
- Heiq Fresh
