Sea to Summit Thermolite Reactor Extreme Regular Liner - Adds up to 15°C

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The Sea to Summit THERMOLITE® Reactor™ Extreme liner is Sea to Summit’s warmest knitted sleeping bag liner. If your adventures take you to colder climates, the Reactor Extreme will add plenty of warmth to a sleeping bag. In warmer weather, it can be used a ‘stand alone’ sleeping bag. The hollow core fibers of the THERMOLITE® fabric work like hollow polar bear or caribou fur – along with the knitted structure, this traps plenty of insulating air. Super soft and amazingly stretchy, the Sea to Summit Reactor Extreme Liner uses a heavier version of THERMOLITE®  to provide extra warmth for an incredibly comfortable night’s sleep. Use one to build your cooler-weather sleep system and to help to keep your sleeping bag clean, too.

NOTE: The degrees' addition are referential only, this might vary due to different factors such as insulation type of your sleeping bag.


  • Adds up to 15º F/25º C of warmth to a sleeping bag.
  • Mummy shape with a box foot.
  • Draw cord hood with mini cord lock.
  • Easy to wash and dry. Helps to keep your down or synthetic-insulated sleeping bag cleaner for longer.


82 in / 208 cm
6.5 x 4.5 in / 17 x 11.5 cm
WEIGHT 14 oz / 399 g

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