Studies show that friction from tossing and turning causes creases in the skin, but a silky smooth surface can reduce that effect in the long run.
Thanks to silk's super smooth texture, hair glides over it without any friction which means you'll be less likely to wake up with frizzy hair, tangles, or bedhead, whereas cotton can snag hair and mess it up into a nest of tangles overnight.
Silk or Satin?
Silk (and cotton) are highly absorbent, which can rob hair and skin of their natural oils. Satin feels cool to the touch, whereas silk warms up with body heat. For those who prefer to sleep on a cool surface, satin is the better choice.