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Sea to Summit Reactor Extreme Mummy Liner

1 review   |  

The Sea to Summit Reactor Extreme Mummy Liner is a sleeping bag liner that adds extra warmth and increases sleeping bag performance by up to 15°C.

With its super insulating 110g/m² Thermolite® fabric, the Sea to Summit Reactor Extreme Mummy Liner offers a spacious design that is slightly tapered from head to foot to reduce weight and increase thermal efficiency. The drawcord hood can be cinched down for extra warmth when required too. This knit fabric also has serious stretch to it, making the Reactor Extreme the ideal liner for the restless sleeper.


  • Mummy shape with a box foot
  • Drawcord hood with mini cord lock
  • Packs into its own Ultra-Sil® stuff sack
  • Length/Width: 183 x 90 cm
  • Suitability: Cold Weather
  • Stuff sack
  • Colour: Red
  • Weight: 399g
    Customer Reviews
    5 Based on 1 reviews
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    • lockdown
    • garden
    • piece kit
    Mark m.
    United Kingdom United Kingdom
    Sea to summit reactor extreme liner

    Great piece kit, have only used it in lockdown in garden, used on its own on very cold nights, very warm

    Rock + Run Sea to Summit Reactor Extreme Mummy Liner Review