@jefftk that's really useful, especially the stubble result. Biking to work in the cold, even a little bit of stubble does a lot to reduce heat loss, so knowing that stubble is not a mask-leak issue is good (especially for next week's predicted temperatures -- which reminds me to try sewing a no-filter cloth mask with "nostrils" away from my glasses. Plain masks in the cold load up with condensate and become very good at stopping both particulates and air in general.
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