Sea to Summit Thermolite Reactor Extreme Liner

Only 3 Left!

The Reactor Extreme uses our super insulating 110g/m² Thermolite fabric to seriously increase sleeping bag performance.

The spacious design is slightly tapered from head to foot to reduce weight and increase thermal efficiency, and the drawcord hood can be cinched down for extra warmth when required. This knit fabric also has serious stretch to it, making the Reactor Extreme the ideal liner for the restless sleeper.


  • Adds warmth to a sleeping bag
  • Mummy shape with a box foot
  • Draw cord hood with mini cord lock
  • Machine washable
  • Packs into its own UltraSil® Cordura® stuff sack
  • 110g/m²
  • Thermolite® construction throughout


  • Weight 399g
  • Dimensions 90x210cm
  • 100% polyester
  • Extra warmth up to 15 degrees Celcius


SKU 509
Brand Sea to Summit
Shipping weight 0.3990kg

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