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Sea to Summit Reactor Thermolite Reactor Extreme Liner

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Increases sleeping bag performance by up to 25 °F (14 °C) with super-insulating 110 g/m Thermolite® fabric. Thermolite® is a hollow core fiber that provides extraordinary warmth for its weight and remains extremely breathable. Spacious design allows for a comfortable night's sleep even when the mercury plummets. Perfect for extending the season of your sleeping bag.


  • 110 gsm Thermolite® construction throughout
  • Adds up 25 °F (14 °C) to warmth to a sleeping bag
  • Mummy shape with a box foot
  • Draw cord hood with mini cord lock
  • Packs into its own Ultra-Sil™ stuff sack
  • Dimensions: 84 × 36 in. / 90 × 210 cm