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® fibers 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

How to Choose

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

Other Liner Options

The Reactor Extreme Liner is a slightly more compact, slightly lower-priced alternative for more moderate temperatures.
Performance-oriented, weight-focused end users may opt to use a Spark or Flame sleeping bag liner.

Shape	Mummy
Color	Gray

Reactor Fleece Liner (Past Season) (Like New)

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