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Sea to Summit Reactor Fleece Liner Thermolite

The Sea to Summit Reactor Fleece Thermolite liner is the warmest of the Reactor range of sleeping bag liners. Used to either extend the warmth of your existing bag or stand alone as a summer bag, the Thermolite Fleece liner is incredibly warm for its weight and has a brushed inner for extra comfort.

Features include a panelled hood which can be drawn in to retain heat and a quarter zip which aids in getting in and out.


  • Smaller and warmer than other fleece liners
  • Can be used alone as a sleeping bag in warmer temperatures
  • Packs away into its Ultra-Sil stuff sack
  • Mummy shaped, and drawstring hood


  • Packed Size: 200 x 70cm
  • Weight: 420g
  • Adds up to 18˚c of warmth 

          Rock + Run Sleeping Bags

          Ethically sourced Polish goose and duck down, combined with lightweight technical fabrics for exceptional warmth, weight and durability.