A vital addition to your sleep setup, the Reactor Extreme liner, featuring Thermolite Pro fabric, harnesses the power of innovative infra-red absorbing ceramic pigments to enhance thermal insulation during colder expeditions. Constructed with a soft and moisture-wicking stretch-knit fabric, this liner ensures unparalleled comfort and unrestricted movement, while its adaptable design allows it to fit seamlessly into any sleeping bag. Moreover, the drawcord footbox provides ample ventilation and the flexibility to move around camp while wearing the liner if necessary. The Reactor liner serves as the core of your sleep system, enhancing the performance of your sleeping bag and sleeping mat in the coldest of conditions Utilizes knitted, hollow-core fibers and infrared-absorbing ceramic pigments to reflect your body's heat back for enhanced warmth and comfort Features a drawcord footbox and shoulder openings that can be opened or closed for optimal comfort, seamlessly integrating with the f