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Sea to Summit Reactor Thermolite Mummy Liner

The Sea to Summit Reactor Thermolite Mummy is a sleeping bag liner that increases sleeping bag performance by up to 8°C. This best selling liner is made with 80g/m² Thermolite fabric - the hollow-core fibre provides amazing warmth to weight ratio and is extremely breathable.


  • Lightweight, more packable than fleece
  • Mummy shape with box foot
  • Drawcord hood with mini cord lock
  • Packs into its own Ultra-Sil stuff sack


  • Packed Size: 210 x 90 cm
  • Weight: 248g

          Rock + Run Sleeping Bags

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