Sea To Summit Thermolite Reactor Liner – Black

The THERMOLITE Reactor liner is our top seller in the sleeping bag liner range. It’s an excellent cold weather option for those who need additional warmth. The hollow core fibers trap heat and offer extraordinary insulating properties. This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. Compact and lighter weight than fleece, this is a best seller for good reason.

Adds up to 14F / 8C of warmth to a sleeping bag

Lighter weight, more packable than fleece

Mummy shape with a box foot

Drawcord hood with mini cord lock

Packs into its own Ultra-Sil? stuff sack