Sea to Summit Reactor Thermolite Liner

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 14°F / 8°C 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