Blissy Silk Pillowcases are handmade and crafted from high quality 22-Momme 100% Pure Mulberry Silk.u00a0 We have spent countless hours prototyping, testing and using our products to ensure the highest quality and durability. A completely natural and hypoallergenic silk pillowcase designed by our team of experts that does wonders for your hair, skin and overall health while you sleep, what could be better? Oh yeah... it's machine-washable too!