Our warmest sleeping bag liner
+ View tech specsThe 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.
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Compressed Volume | 2.5 Liters |
Dimensions | 200 x 70 cm |
Packed Size | 22 x 13 cm |
Packed Volume | 2.75 L |
Weight | 379 g |
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.
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.
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.