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Tentworld February 2026 - Your Summer Escape Kit Catalogue
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SKU: 053202PLU: 156115UPC/EAN: 9327868169771

Sea To Summit Reactor Lightweight Sleeping Bag Liner - Regular

$76.49
Save $13.5 (15%)RRP $89.99

Arrives in-store: 24 February
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description

The Sea to Summit Reactor Lightweight Liner is built to boost warmth without adding bulk. Using advanced Thermolite® Pro fabric with infrared-absorbing ceramic pigments and hollow-core fibres, it helps trap body heat and enhance your sleep system performance. Adding up to 4°C of warmth, it’s an ideal upgrade for ultralight expeditions where every gram counts.

The stretch-knit construction and articulated arm openings allow unrestricted movement through the night, so comfort isn’t compromised. Treated with HeiQ Fresh odour control, the liner is quick-drying, machine washable, and helps extend the life of your sleeping bag by reducing how often it needs washing. Lightweight, practical and performance-driven, it’s a smart addition to any serious kit.

features

  • Lightweight and insulative, Thermolite® Pro technology with hollow-core fibres and infrared-absorbing pigments enhances warmth with minimal pack size
  • Freedom to Move – Stretch-knit and shaped arm openings allow unrestricted movement, providing natural comfort throughout your sleep
  • Technical Shape and Hood – Ergonomic design with a fitted hood delivers optimal warmth and comfort without extra weight or bulk
  • Fits any sleeping bag - Stretch fabirc means the Reactor Liner fits any shape of sleeping bag
  • Stay Fresh Longer – HeiQ Fresh odour control technology keeps the liner fresh after extended use
  • Sleep System Integration – Snap connectors at the shoulders easily pair with Sea to Summit sleeping bags for quick, hassle-free entry and exit
  • Easy to Keep Clean – Machine washable construction simplifies care and reduces wear on your sleeping bag over time
  • Lower Impact Materials – Crafted with certified recycled fibres and bluesign APPROVED materials to minimise environmental impact

Frequently Asked Questions

  • How much warmth does a Reactor Lightweight add to a sleeping bag?
    The added warmth depends on how well the sleeping bag retains heat and how well the sleeping pad insulates. When paired with a quality bag and mat, a Reactor Lightweight can add up to 4 °C 
  • Can a Reactor be machine washed and dried?
    Reactor liners can be machine washed without special soaps. Do not use fabric softeners. Air dry or machine dry on a cool to warm cycle without dryer sheets.
  • Can a Reactor Lightweight work as a stand-alone sleeping bag?
    In summer temperatures and still air conditions, a Reactor Lightweight can function on its own for sleepers wearing long base layers. The fabric is not windproof.

specifications

Dimensions: 193 x 80cm
Packed Dimensions: 10 x 18 x 10cm
Weight: 255g
Maximum User Height: 185cm
Best Use: Backpacking, Cycle touring, Paddle touring
Materials (Liner): 100% Post-Consumer Recycled Polyester
Materials (Carry Bag): 100% Polyester

warranty

Covered by the Sea To Summit limited lifetime warranty against defects in materials or workmanship

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