Sea To Summit Reactor Thermolite Compact Plus Liner

Size Guide
Size :

The THERMOLITE® Reactor™ Compact sleeping bag liner is the ideal choice for gram counters under 6 feet who want to add warmth to their sleep system. The world’s first ‘hybrid’ sleeping bag liner uses a combination of two weights of THERMOLITE® fabric, with the warmer fabric strategically positioned across the torso and in the footbox. The hollow core THERMOLITE® fibres work like the hollow fur of a polar bear to trap extra insulating air. The Reactor Compact Plus keeps your sleeping bag clean and is super easy to wash. It will bump up the warmth of your sleeping bag considerably, depending on your metabolism, your sleeping bag and sleeping pad, and the environment.

  • Adds up to 20°F /11°C of warmth to a sleeping bag
  • Lighter weight, more packable than fleece
  • Mummy shape with a box foot
  • Drawcord hood with mini cord lock
  • Packs into its own Ultra-Sil™ stuff sack

Best Use

Backpacking, Bike Touring, Travel, Camping


Adds up to 11°C to the temperature range of your sleeping bag
Other liners available here.


Easy to wash and dry. Helps to keep your down or synthetic-insulated sleeping bag cleaner for longer

ADDED WARMTH: Up to 20°F / 11°C
BEST USE: Backpacking, Camping & Winter Camping
COMES WITH: Ultra-Sil stuff sack
MATERIAL(S): Thermolite polyester fabric
SHAPE: Mummy

Is it suitable for use with a rectangular / wide sleeping bag? The knitted fabric of the Reactor is so stretchy that you won’t feel the shape of the liner at all.

Is it equipped with a zipper? The beauty of our sleeping bag liners is their minimal weight and packed size, and a zipper would significantly increase both.

Sea to Summit Reactor Plus

Sea To Summit Reactor Thermolite Compact Plus Liner
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