Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
Reactor Fleeceweight Sleeping Bag Liner
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Reactor Fleeceweight Sleeping Bag Liner

$134.95
Thermal sleeping bag liner for cold-weather backpacking, ski touring, and warm-weather overnight use on its own.
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Size

The Sea to Summit Reactor Fleeceweight Sleeping Bag Liner is built to add meaningful warmth to your sleep system without a big penalty in weight or bulk. Thermolite® hollow-core fibers and grid fleece trap and reflect body heat to add up to 8°C|14°F, making it a practical choice for cold-weather backpacking and ski touring when your bag needs a little more range. In warmer conditions, it can also be used on its own as a lightweight sleeping bag.

What stands out in use is how easy it is to live with. The stretch fleece, shaped arm openings, and fitted hood let you move naturally instead of feeling wrapped up and restricted, and the shoulder snap attachments integrate cleanly with Sea to Summit sleeping bags for simpler entry and exit. It is machine washable, quick-drying, and treated with HeiQ Fresh odor control, so it stays fresher on longer trips and helps reduce how often you need to wash your sleeping bag, which goes a long way toward preserving loft over time.

Best For

  • Cold-weather backpacking
  • Ski touring
  • (Stand-alone) summer use

Type

  • Thermal Liner

Features

  • Boosts Sleep System Warmth – Reactor Fleeceweight uses Thermolite® hollow-core fibers and grid fleece to trap warmth with minimal added weight.
  • 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.
  • Stay Fresh Longer – HeiQ Fresh odor 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 fibers and bluesign APPROVED materials to minimize environmental impact.
  • Can be used on its own as a lightweight sleeping bag in warm-weather conditions.

Materials

  • Material(s): 100% Post-Consumer Recycled Polyester
  • Stuff Sack: 100% Polyester

Size Specs

  • Short: Weight 12.9oz 365g; Dimensions 70.1 x 31.5 in 178 x 80 cm; Packed Size 5.9 x 9.8 x 5.9 in 15 x 25 x 15 cm
  • Regular: Weight 14.1oz 400g; Dimensions 76.0 x 31.5 in 193 x 80 cm; Packed Size 5.9 x 9.8 x 5.9 in 15 x 25 x 15 cm
  • Long: Weight 15.2oz 430g; Dimensions 81.1 x 31.5 in 206 x 80 cm; Packed Size 5.9 x 9.8 x 5.9 in 15 x 25 x 15 cm

General Specs

  • Weight: 12.9oz | 365g
  • Length: 70.1in | 178cm
  • Packed Size: 5.9 x 9.8 x 5.9 in | 25 x 15 x 15 cm
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Reactor Fleeceweight Sleeping Bag Liner
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For more information view our FAQ page

  • Free shipping on orders over $99 (oversize charges may apply) - Read our shipping policy for more information.

  • Standard shipping estimates are as follows:

    Alberta and British Columbia: 2-4 business days

    Saskatchewan and Manitoba: 3 - 4 business days

    All other provinces and territories: 5 - 9 business days

  • We offer fast & easy returns on most products. Exceptions include products 30% off or more, climbing gear, underwear & more.

    Read our return policy here.
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