Description || Reactor Fleece Liner (adds up to 32°F)

Reactor Fleece Liner (adds up to 18°C)

₹ 9,019.00
₹ 9,019.00
₹ 9,019.00

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Our warmest sleeping bag liner

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Shape: Mummy
Colour: Grey
Subtotal: ₹ 9,019.00
Reactor Fleece Liner (adds up to 18°C)

Reactor Fleece Liner (adds up to 18°C)

₹ 9,019.00 ₹ 9,019.00

Reactor Fleece Liner (adds up to 18°C)

₹ 9,019.00 ₹ 9,019.00
Shape: Mummy
Colour: Grey


The THERMOLITE® Reactor Fleece liner is Sea to Summit’s warmest sleeping bag liner. Add one to your sleeping bag before heading into really cold environments, or use it as a 'stand alone' sleeping bag when the weather is warmer. The core THERMOLITE® fibres have the same hollow structure as a polar bear's fur, which traps a high level of insulating air. Luxuriously soft, the Reactor Fleece is perfect as part of a cold weather sleep system – plus it will help keep your sleeping bag clean.


  • Traps insulating air to increase warmth of a sleeping bag by up to 32°F /18°C
  • Thermolite® fleece fabric is incredibly comfortable.
  • Technical mummy-shape with drawstring hood.
  • Quarter zip makes it easy to get in and out.
  • Easy care – machine wash with no special soap needed. Avoid fabric softeners and dryer sheets.
  • Ideal for use as a sleeping bag in warmer weather or sandy environments.
  • Packs into its own Ultra-Sil stuff sack

BONUS: Easy to wash and helps to keep your down bag cleaner for longer

The Reactor Fleece is Perfect For...

  • Backpackers looking to add warmth to their sleeping bag for winter camping
  • Warm-weather campers who don’t need a full sleeping bag
  • Paddlers or desert users who want an easy-care summer sleeping bag they can easily wash the sand out of
  • Backpackers looking to extend the performance of a (perhaps older) sleeping bag for winter camping


  • Added Warmth
    Up to 32ºF / 18ºC
  • Best Use
    Camping, Winter Camping & Travel
  • Comes With
    Ultra-Sil stuff sack
  • Material(s)
    Thermolite fleece
  • Shape
  • Zip Options
    1/4th length zipper
Compressed Volume2.5 Liters
Dimensions 200 x 70 cm
Packed Size 22 x 13 cm
Packed Volume2.75 L
Weight 379 g



Frequently Asked questions

Can you use this fleece sleeping bag liner instead of a sleeping bag?

In many cases, you can use your sleeping bag liner on its own. Keep in mind, though, that fleece fabric is not windproof and won't provide that extra protection from weather at night.

Will this sleeping bag liner add 32°F / 18°C to any sleeping bag?

Adding this sleeping bag liner won't necessarily increase the temperature inside your sleeping bag by 32°F / 18°C. There are a lot of factors involved in the thermal performance of a sleep system, starting with the insulation value of your sleeping pad.

Is this sleeping bag liner good for backpacking?

The Reactor Fleece sleeping bag liner is light and small enough to fit in your pack and could be worth carrying for the additional warmth. Weight-conscious and ultralight backpackers may opt for a Spark Liner or Flame Liner.

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