Silk is hypoallergenic and less absorbent, preventing the trapping of oil or bacteria on the pillowcase, which benefits the skin and complexion as well. "Silk hair protectors like scarves or bonnets help reduce the friction caused by laying on a cotton pillow, which causes split ends, knotting, frizz, tangles, and hair damage," explains Celebrity Hairstylist and founder of Contents Hair Care Cheryl Bergamy. "Silk helps to keep the moisture in the hair, while cotton pillows or scarves absorb natural oils leaving hair dry and brittle." 

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