I find that the lower limit of a poncho liner (really all TQs) is completely dependent on what UQ you pair with it. I use a poncho liner for summer trips (in US Southeast) and love it. However, when fall comes I sometimes forget to swap to warmer quilts. If I use the PL with a 20deg SLD TrailWinder, I'm perfectly fine down about 50 degF or a little lower. However, if I use the PL with a 40deg 3/4 Phoenix UQ, I freeze even in the high 50s.
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