Sea to Summit

Thermolite® - REACTOR EXTREME Liner - Regular

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Sleeping Bag Liner.

The Thermolite REACTOR EXTREME Sleeping Bag Liner by Sea To Summit extends the seasonal use of your sleeping bag with a lightweight liner that keeps you warm. The fabric is a breathable hollow-core fibre with an exceptional warmth-to-weight ratio. It adds up to 14C of warmth to your regular sleeping bag. The liner comes in a mummy shape with a box foot. It packs up small into its own stuff sack.

  • 110g/m2 Thermolite insulation
  • Adds up to 14 degrees C warmth
  • Mummy shape, toe box
  • Draw cord hood
  • Mini cord lock
  • Packs into Ultra-Sil stuff sack


• Weight: 14 oz / 399g
• Dimensions: 82 in / 208 cm

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