Thermal underwear is known by many names — long johns, base layers, long underwear, skivvies, or even britches (for my Southern friends). No matter what you call them, they are a staple for anyone ...
Even among long trails, the John Muir Trail ... Adam Tycaster All this might sound intimidating, but hiking the John Muir Trail is eminently doable. It is a well-signed, beautifully maintained trail.
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