The Silk Wave Sleep Set Our 6A Grade hypoallergenic silk pillowcase does wonders for your hair while your curls are setting, adds anti-frizz protection, and added skin benefits while targeting the overall health of your hair and skin while you sleep. Lightweight and breathable. Whether you decide to Silk Wave your hair overnight, our pillowcase will keep your hair set, with no tangles, and added shine. With a smooth, soft surface for your skin. Which is proven over time to enhance collagen and improved product absorption in your skin.