Q: Are satin pillowcases good for your hair?
A: Yes. Hair slides across satin rather than catching, so there is far less friction overnight than on cotton. That is what reduces frizz and helps a blow-dry last.
Q: Are satin pillowcases good for your skin?
A: The smooth surface causes less tugging on the face overnight and absorbs less of your skincare than cotton, which is the practical benefit most people notice.
Q: Are satin pillowcases as good as silk?
A: For friction, they perform very similarly, which is what matters for hair and skin. Silk is the more breathable natural fibre; satin gives you most of the benefit at a fraction of the price.