You’ve probably heard the buzz around silk pillowcases by now, but if you’re wondering if it’s worth the price tag, we’re here to tell you that it definitely is—especially when it’s only $19, like this luxe Zimasilk Mulberry Silk Pillowcase ($22; amazon.com). Many swear by the beauty benefits of silk pillowcases—such as preventing wrinkles and signs of aging on the skin and keeping hair smooth and knot-free overnight—and dermatologists have even weighed in on the advantages of making the switch to silk from other materials. Debra Jaliman, MD, a New York City-based dermatologist, told Health in a past interview that cotton or polyester pillowcases can deplete moisture from your skin and hair overnight, leaving you feeling extra-dry in the morning. She recommends opting for a silk pillowcase instead, because your skin simply “slides on the pillowcase” and it can even help slow signs of aging. You may be hesitant to hop on the silk pillowcase bandwagon because of the luxury price tag on some silk or satin options—but believe it or not, investing in these skincare saviors doesn’t have to be expensive. Case in point: The Zimasilk Mulberry Silk Pillowcase on Amazon costs just $22.  Bu...