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. The stretch-knit fabric provides optimal comfort, and ensures the Reactor fits any sleeping bag. Choose between the classic Mummy and the Mummy with Drawcord - the footbox opening offers plenty of ventilation and the versatility of walking around camp while still wearing your liner if needed.

• 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
• HeiQ Fresh odour control technology helps keep the liner fresh even after extended use.
• Knitted fabric provides incredible stretch and freedom of movement - Reactor liners work perfectly with sleeping bags of any shape.
• Sea to Summit Guarantee is offered for the Lifetime of this product.