The Sea to Summit Reactor Extreme Thermolite Liner. Increases sleeping bag performance by up to 25° F (15° C) with super-insulating 110g/m2 Thermolite fabric. Spacious design allows for a comfortable night's sleep, even when the mercury plummets.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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