Stop waking to a bird's nest. Constant friction from cotton causes frizz and...

https://wiki-planet.win/index.php/Why_is_everyone_talking_about_friction_and_hair_cuticles_now%3F

Stop waking to a bird's nest. Constant friction from cotton causes frizz and stubborn morning tangles. Small habits, like a silk pillowcase or a loose braid, protect your hair while you sleep. It is an easy way to keep locks smooth