Thermolite Reactor Extreme liner

The Sea To Summit Thermolite® Reactor Extreme increases sleeping bag performance by up to 14°C with its super insulating 110g/m_ Thermolite® fabric.

The spacious design allows for a comfortable night’s sleep, even when the temperature plummets. The Thermolite® Reactor Extreme adds warmth to a sleeping bag or, used alone, is ideal as a warm weather bag.

With the stretchy knit fabric that moves with you and a draw cord hood, this liner is perfect for wrigglers and rollers or anyone who needs some extra warmth.