According to a US dermatologist… “Persistently pressing your face into a pillowcase causes trauma to the skin, which over time is aggravated even more by the friction caused by a cotton pillowcase. This can create permanent creases (wrinkles) as collagen, which keeps your skin elastic, breaks down.” So silk seems to be the anti-ageing option.
Another plus: Silk absorbs less moisture than cotton, so this helps keep your skin hydrated while you sleep. (Loving that!) And finally, dust mites are unable to live in silk, so if you have allergies you’re more likely to sleep easy on a silk pillowslip.