SDC1 Are you getting confused with Silk?
Satin is the weave, silk is the fibre.
Synthetic satin is the type of satin which will emphasise its satin-ness on its packaging, rather than its component material (man-made fibres like rayon or nylon). It also tends to be the shinier.
I'm no expert but you can google it and find out more information before buying.
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