Sea to Summit

Thermolite Reactor Extreme Sleeping Bag Liner

$99.95
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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.

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.

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We were established almost 75 years ago by John Monod, a Swiss mountain guide and ski instructor. Quality outdoor gear is what our brand was built upon since 1949. Learn more.

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