Sea To Summit

Sea to Summit - Thermolite Reactor Liner (Adds 8°C)

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  • Regular price $89.95

Sea to Summit's most popular sleeping bag liner! The Reactor is made from 80g/m² THERMOLITE®—the lightest weight THERMOLITE® fabric available. THERMOLITE® is a hollow core fibre that provides amazing warmth for its weight and remains extremely breathable. The Reactor adds up to 8°C of warmth to your sleeping bag or can be used alone as a warm weather bag.


  • Lighter weight, more packable than fleece
  • Mummy shape with a box foot
  • Drawcord hood with mini cord lock
  • Extends life of sleeping bags by keeping them clean
  • Contrasting colour along the top edge makes it easier to find the opening
  • Adds warmth to a sleeping bag
  • Packs into its own UltraSil® stuff sack
  • Machine washable

Technical Specs

Best Use


Sleeping Bag Shape


Added Warmth (F)

Up to 15 degrees

Added Warmth (C)

Up to 8 degrees

Stuff Sack Size

3 x 5 inches




82 x 35 inches


8.1 ounces