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. The hollow core fibers of the THERMOLITE® fabric work like hollow polar bear or caribou fur – along with the knitted structure, this traps 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 to keep your sleeping bag clean, too.
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
Easy to wash and helps to keep your sleeping bag cleaner for longer.