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.

Specifications

　　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 at 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 sleeping bag into shoulder seasons

　　• 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

　　• Adds up to 25°F / 14°C

　　• 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 included Ultra-Sil™ stuff sack