slip Queen/Standard Pure Silk Pillowcase in White. slip Queen/Standard Pure Silk Pillowcase in White. Not all silk pillowcases are created equal. Like an 8-hour beauty treatment every night, slip Pure Silk Pillowcase is made using slipsilk, developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durability. Loved by dermatologists, celebrity hairstylists, and beauty experts, silk fibers are significantly less absorbent than many other fibers, so they can help keep your skin's moisture and expensive face and hair products where they belong - on your face and hair. As skin ages, it loses elasticity and sleep creases can become more pronounced and longer-lasting. While the creases usually go away later that day, they can be gradually 'ironed in' over the years. slipsilk can help to reduce friction*, allowing skin to glide along the pillow while reducing extra pressure on creased skin. It can also help reduce friction on hair throughout the night, preventing pulling, tangling, creasing, and damage, so you can wake up in the morning without bed head. *In laboratory testing, slipsilk pillowcases were shown to create 43% less friction on average, which can reduce stretching and tugging on delicate facial skin and hair tangling during the night.. In White - fits queen/standard size pillows. Made from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 momme. Non-toxic dyes. Machine washable. Use up to eight hours daily for maximum results. Machine washable on a cool/delicate cycle - delicates wash bag recommended. Use a pH neutral liquid detergent and/or fabric softener. SLIP-WU4. 853218006094.