Stay warm and cozy in frigid temperatures with this Sea to Summit Reactor Mummy Sleeping Bag Liner. It is made with Thermolite® Pro fabric with infrared-absorbing ceramic pigments and Thermolite® EcoMade fibers to provide a thermal boost, and HeiQ Fresh odor control technology helps keep the Reactor liner fresh, even after extended use. Sea to Summit Reactor Mummy Sleeping Bag Liner Yellow - Famly/Tech Sleepn Bags at Academy Sports