Experience the comfort of the Sea to Summit Reactor Lightweight Liner, a key addition to your camping sleep system. Ideal for cool or cold nights, this liner uses Thermolite Pro Technology, featuring knitted hollow-core fibers with infrared-absorbing ceramic pigments to reflect body heat, ensuring enhanced warmth and comfort. The stretch-knit fabric ensures a snug fit inside any sleeping bag, while the classic mummy design provides shoulder openings for free arm movement. Choose from versatile footbox options for added ventilation and mobility around camp. With eco-friendly Thermolite EcoMade fibers, it seamlessly combines sustainability with performance. Whether you're hiking in the mountains or camping in the woods, this liner promises to extend your warmth in colder conditions.