The Sea to Summit 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 Sea to Summit Reactor Extreme Liner 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.

NOTE: The degrees' addition are referential only, this might vary due to different factors such as insulation type of your sleeping bag.

Details:

• Adds up to 15º F/25º C of warmth to a sleeping bag.
• Mummy shape with a box foot.
• Draw cord hood with mini cord lock.
• Easy to wash and dry. Helps to keep your down or synthetic-insulated sleeping bag cleaner for longer.