Sleeping bag liner Sea to Summit Reactor Extreme

Warming liner sheet for sleeping bag

THERMOLITE® Reactor Extreme is Sea to Summit's warmest seamless sleeping bag liner. Reactor Extreme provides additional warmth to the sleeping bag, and in warm weather or indoors, it can be used as a hygienic sleeping bag on its own.

The hollow fiber of THERMOLITE® fabric act like polar bear fur and, combined with a specially knitted structure, effectively trap warm air. Super soft and surprisingly flexible, the Reactor Extreme uses a heavier version of THERMOLITE® to provide extra warmth for an incredibly comfortable night's sleep.