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Thermolite Reactor Sleeping Bag Liner

Sea to Summit

Thermolite Reactor Sleeping Bag Liner

Thermolite Reactor Sleeping Bag Liner is available to buy in increments of 1

The THERMOLITE® Reactor™ liner is Sea To Summit's top seller in the sleeping bag liner range. It's an excellent cold weather option for those who need additional warmth. The hollow core fibers trap heat and offer extraordinary insulating properties. This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. Compact and lighter weight than fleece, this is a best seller for good reason.



  • Adds up to 14°F / 8°C of warmth to a sleeping bag
  • Lighter weight, more packable than fleece
  • Mummy shape with a box foot
  • Drawcord hood with mini cord lock
  • Packs into its own Ultra-Sil™ stuff sack
  • Packed size is similar to a small foam football
  • Easy to wash and helps to keep your down bag cleaner for longer
  • Mummy Shape (With Hood)
  • Includes Ultra-Sil stuff sack
  • Best Use: Backpacking, Camping

Liner Shape: Mummy

Dimensions (Entry / Foot Width x Length): 36"/24" x 82" (92/62 x 208 cm)

Added Warmth: Up to 14°F (8°C)

Claimed Weight: 8.7 oz (248 g)

Stuff Sack Size: 5.75" x 4" (15 x 11 cm)

Materials: Thermolite polyester fabric

Manufacturer Warranty: Lifetime against defects in materials and workmanship