An esssential component in your sleep system, the Reactor Extreme liner with Thermolite Pro fabric utilises innovative infra red-absorbing ceramic pigments to give your sytem the thermal boost needed in colder-weather adventures.The soft, wicking stretch-knit fabric provides unmatched comfort and freedom of movement while still allowing the Reactor Extreme liner to fit any sleeping bag. Additionally, the drawcord footbox offeres plenty of ventilation and the versatility of walking around camp while still wearing your liner if needed.Features:- Thermall boost to retain heat and warmth. As the core of your sleep system the Reactor liner extends the performance of your sleeping bag and sleeping mat in the coldest of condtions- Thermolite Pro technology using knitted, hollow-core fibres and infrared-absorbing ceramic pigments to reflect your body’s heat back from enhanced warmth and comfort- Drawcord footbox and shoulder openings can be opened or closed f