If today is Thursday, we must be in ripstop.
Calendering is a process that compacts the fibers in a fabric to make it more wind resistant, among other things, "other things" being, for example, more lustrous, having a glazed appearance, and embossing with various patterns, none of which are the least bit interesting to backpackers. All they want is supper and a cozy place to sleep, so shiny surfaces come in at about 476th place.
Calendering is usually done by running fabric between pressure rollers, sometimes with heat. Usually with heat. It's a technical thing.
Kinda makes me sleepy just hearing about it. You too? So let's quit here.
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Me? I suddenly seem to have some pressing business to attend to. Bye.