Add warmth to your sleep system in cool or cold conditions: with our Reactor Liner. Using Thermolite Pro fabric with infra red-absorbing ceramic pigments and Thermolite EcoMade fibres , the new Reactor takes thermal performance to the next level.

• Thermal boost to retain heat and warmth. As the core of your sleep system the Reactor liner extends the performance of your sleeping bag in colder conditions
• Thermolite Pro technology using knitted, hollow-core fibres and infrared-absorbing ceramic pigments to reflect your body's heat back for enhanced warmth and comfort
• The classic Mummy version has practical openings in the shoulders to allow the user to stretch his or her arms out
• In the version with the drawcord footbox, the base or shuolder openings can be opened or closed for optimal comfort. They integrate perfectly with the Free-Flow Zip system in select Sea To Summit sleeping bags. Open the base drawcord, and you can hitch the liner up and walk round camp - perfect for bathroom breaks