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Our warmest liner, and the piece that anchors a cold-weather sleep setup. Hollow-core Thermolite® Pro fibers run in a grid pattern across the Reactor Fleece Liner, trapping heat where you need it most.
Temperature control comes from two places: shoulder zippers and a drawcord footbox. Both line up with the Free Flow-Zip system on Sea to Summit sleeping bags, so the liner and bag work as one unit. In warm weather the Reactor Fleece works fine on its own as a stand-alone sleeping bag, and the footbox drawcord gives you ventilation plus the option to walk around camp still wearing it.
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