If your sleeping system needs some extra warmth, then the Thermolite Reactor Liner from Sea to Summit will add up to 8°C and help keep your sleeping bag clean.

This liner is made from Thermolite hollow core fibres which traps heat and has excellent insulating properties while being lighter than fleece. Thermolite is also soft and super stretchy so it’s really comfortable. The design of this liner is optimised for warmth, as it has a mummy shape, footbox and a drawcord hood. It will add up to 8°C of warmth to a sleeping bag, or it can be used on its own as the ideal warm-weather bag. The Thermolite Reactor also comes with a stuff sack included, so you can store it away neatly when not in use.

Prolong the life of your sleeping bag, and add extra warmth with the Thermolite Reactor Liner from Sea to Summit.

• Adds up to 8°C of warmth to a sleeping bag
• Made of ultra-lightweight Thermolite fibre
• Mummy shape with a box foot
• More compact and warmer for its weight than fleece liners
• Thin drawcord with tiny cord-lock around the hood
• Packs into its own lightweight sack
• Use inside a sleeping bag for extra warmth or as a stand-alone bag in warm weather