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This is the warmest liner we make. Hollow-core Thermolite® Pro fibres are laid out in a grid-pattern fleece, and the result adds real heat to a cold-weather sleep system instead of just protecting the bag.
Shoulder zippers and a drawcord footbox let you vent when the night turns milder, and both line up with the Free-Flow Zip system on select Sea to Summit sleeping bags. On warm trips the Reactor works as a stand-alone sleeping bag, and you can walk around camp still wearing it with the footbox open.
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