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    Sea to Summit Reactor Extreme Liner


    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. In warmer weather, it can be used a ‘stand alone’ sleeping bag. 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.


    • Stretchy, Thermolite® fabric is incredibly comfortable
    • 110g/m² fabric is warmer than the 80g/m² Thermolite® used in the standard Reactor
    • Works like your favorite cold-weather base layer to trap insulating air and increase warmth
    • Easy care – no special soap is needed
    • Significantly improves the thermal performance of your sleeping bag
    • Comfortable stretchy fabric
    • Keeps sleeping bag clean
    • Machine wash and air dry - Avoid fabric softeners & dryer sheets to maintain wicking performance
    • Packs into its own Ultra-Sil™stuff sack