Satin bonnets are a popular go-to to take care of curls. Putting your head on certain fabrics damages curls and undoes all the hard work you put in on wash day. Especially your pillow. You may lay your head on the couch, or up against a chair, or leave it down as it rubs against your clothes. All resulting in frizz. To solve this, many people turn to a satin bonnet. Bonnets are also used for plopping.
Options include short hair, long hair (oversized), and afro.
*All hair types