Sea To Summit Thermolite Reactor Extreme Liner


The Thermolite Reactor Extreme increases sleeping bag performance by up to 15°C with its super insulating 110g/m² Thermolite® fabric. Spacious design allows for a comfortable night’s sleep, even when the mercury plummets. Thermolite® is a fibre with a hollow core that provides extraordinary warmth for its weight while remaining extremely breathable. The Thermolite® Reactor Extreme adds warmth to a sleeping bag or, used alone, is ideal as a warm weather bag. With the stretchy knit fabric that moves with you and a draw cord hood, this liner is perfect for wrigglers and rollers or anyone who needs some extra warmth.


  • 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
  • Colour: red



  • Weight 399 G
  • Dimensions 90 x 210cm
  • Material
  • Extra Warmth Up To 15°C


Barcode # 9327868022304
Brand Sea To Summit
Shipping Weight 0.5000kg
Shipping Width 0.050m
Shipping Height 0.050m
Shipping Length 0.050m
Shipping Cubic 0.000125000m3
Unit Of Measure ea


By: on 4 September 2018
Definitely lived up to the hype, I was super cosy in this stretchy sleeping sack in winter with a mid range sleeping bag. Very happy with the purchase.

Pocket sized liner

By: on 24 July 2018
I haven't used this yet, but I'm hoping it will give my sleeping bag a few degrees more warmth. It was recommended to me by several retailers, all had run out of stock. I was happy with my purchase online as the price was brilliant.

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