Not only are this brand's pillowcases popular, the Slip Slipsilk Scrunchies ($20-$39) are also bestsellers at Sephora. Much like the pillowcases help protect your hair from breakage or creasing while you're asleep, these soft scrunchies do the same thing when you use them in your day-to-day styles — either the three minis' set or the kit with six larger versions.