Satin is a smooth, lustrous fabric that has long been used in high-end bedding and pillowcases due to its ability to reduce hair friction. This same principle applies to satin-lined hats.

We tested and rounded up the best satin-lined hats (aka slaps) and talked to a trichologist to understand why silk and satin are better for your hair.

Silk-lined hats are the best way to prevent frizzy hat-hair during the winter. From sleep cabs and cable knit beanies to fancy French berets, here are the best silk-lined hats.