Fact: Silk pillowcases are dreamy. In case you missed it, the material actually gives new meaning to the phrase ‘beauty rest,’ namely because it boosts both skin and hair hydration. The reason for this is that silk pillowcases tend not to absorb oil in the way that cotton does, which means more product stays where it’s intended to, as opposed to becoming an oil stain that invites bacteria to the very place you rest your head. (Tip: Side sleepers who break out on the cheek they smoosh into their pillow on a nightly basis might benefit from silk.) Indeed, silk pillowcases are a luxury that’s well worth the investment...the only drawback is that they’re rather delicate. So if you’re wondering how to wash silk pillowcases, you’ll be relieved to know it’s actually not as hard as you think, especially with our handy guide to see you through.