Reactor Extreme Liner (adds up to 25°F) - Past Season (Like New)

★★★★★ 5.0 54 reviews

US$14.99

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US$14.99

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Product details

Management number	235387840	Release Date	2026/07/02	List Price	US$14.99	Model Number	235387840
Category	Outdoor & Sports General

The THERMOLITE® Reactor™ Extreme liner is Sea to Summit’s warmest knitted sleeping bag liner. If your adventures take you to colder climates, the Reactor Extreme will add plenty of warmth to a sleeping bag. Plus in warmer weather, it can be used as a ‘stand alone’ sleeping bag. The hollow core fibers of the THERMOLITE® fabric work like a polar bear's fur and, along with the knitted structure, trap plenty of insulating air. Super soft and amazingly stretchy, the Reactor Extreme uses a heavier version of THERMOLITE® to provide extra warmth for an incredibly comfortable night’s sleep. Use one to build your cooler-weather sleep system and to help keep your sleeping bag clean too.

Features

Traps insulating air to increase warmth of a sleeping bag by up to 25°F / 15°C
Stretchy, Thermolite® fabric is incredibly comfortable.
110g/m² fabric is warmer than the 80g/m² Thermolite® used in the standard Reactor.
Technical mummy-shape with drawstring hood.
Easy care – machine wash with no special soap needed. Avoid fabric softeners and dryer sheets.
Keeps sleeping bag clean.
Packs into its own Ultra-Sil stuff sack.

How to Choose

The Reactor Extreme is Perfect For…

Backpackers whose sleep system will be used in colder climates
Campers whose sleeping bags don't keep them warm a the advertised temperature
Very warm-weather campers who don't need a full sleeping bag
Campers or backpackers looking to extend the performance of a (perhaps order) sleeping bag into shoulder seasons

Other Liner Options

The Reactor Fleece Liner will add even more warmth to your sleeping bag.
Performance-oriented, weight-focused end users may opt to use a Spark or Flame as a sleeping bag liner.