TW's Inc. toddler & Young men silk set

Silk Satin bonnets can be good for hair because they can help prevent breakage, frizz, and tangles, and retain moisture:
Reduce friction
The smooth surface of satin reduces friction between your hair and your pillowcase, which can help prevent breakage and damage to your hair shaft. Friction can cause your hair cuticles to lift, making your hair more susceptible to damage.
Retain moisture
Silk Satin acts as a barrier against moisture-absorbing fabrics like cotton, which can help prevent split ends and keep your curls fresh longer.
Protect hairstyles
Satin bonnets can be great for protecting hairstyles like Locs, braids, twists, and curls.