Sea to Summit

Reactor Extreme Liner (Thermal Boost +15%)

Sale price€89.99
In stock (5 units), ready to be shipped
Boost your sleeping bag's warmth by up to 15% with the Sea to Summit Reactor Extreme Liner.

The Sea to Summit Reactor Extreme Liner increases sleeping bag warmth by up to 15%, providing added insulation in cold climates. Ideal for backpacking and camping.


  • Traps insulating air to boost warmth by up to 15% for 1-season bags, 7% for 3-season bags
  • Sustainable construction: 50% Thermolite®EcoMade from 100% textile waste and GRS Certified, 50% Thermolite® Pro with infrared technology
  • Heiq Fresh FFL biocide-free effective odor control
  • Technical mummy shape with drawstring hood
  • Available in two sizes: regular and compact
  • Easy care: machine washable, avoid fabric softeners and dryer sheets
  • Packs into its own Ultra-Sil stuff sack
Dimensions 216 x 80 cm
Weight 364 g
Packed Size 12 x 15 cm
Material(s) Thermolite® Pro & Thermolite® EcoMade
Shape Mummy
Added Warmth Up to +15% for 1-season bags, 7% for 3-season bags
Best Use Backpacking, Camping & Winter Camping
Comes With Ultra-Sil stuff sack
Care Instructions:
Washing: Machine wash in cold water using a mild detergent. Avoid fabric softeners and dryer sheets.
Drying: Air dry or tumble dry on low heat.
Storage: Store in a cool, dry place, and avoid prolonged exposure to direct sunlight.
Expert Advice: Regularly check for wear and tear, especially in high-stress areas like seams and drawstrings.


€5.95 Delivery, Free over €75
Standard Delivery within 1-2 days with An Post priority parcel: €5.95

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Returns Policy
Returns Accepted within 28 days. Exclusions apply.

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Free Delivery over €75
To all 32 counties in Ireland.

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Sea to Summit

Sea To Summit offer lighter, better performing outdoor & camping gear for every adventure, from high-altitude backpacking expeditions to family car camping. With highly durable options and a lifetime guarantee, they are sure to perform.

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