From Slip, the Petal Queen Zippered Pillowcase features: 1 x petal pure silk queen pillowcase with contrast piping and invisible zipper closure (20" x 30" / 51cm x 76cm)  Dermatologist recommended Laboratory tested Hypoallergenic The beauty secret of celebrity hairstylists, dermatologists and beauty experts Clinically shown to visibly improve: The appearance of fine lines Skin hydration Skin texture and smoothness Skin radiance, luminosity or brightness Over 95% of users agreed sleep creases, sleep lines and sleep wrinkles were fewer and less noticeable The Slipsilk difference: Slip pure silk products are made using Slipsilk, developed and refined for over ten years to provide the ultimate combination of shine, thickness, softness and durability Anti-aging: We spend a third of our lives in bed. In laboratory testing, Slipsilk pillowcases were shown to absorb significantly less face cream than cotton pillowcases†, so they can help keep your skin’s moisture and valuable face and hair products where they belong, on your face and hair Slipsilk was also shown to create 43% less friction on average†, which can reduce stretching and tugging on delicate facial skin Anti-sleep crease: Slipsilk has been shown to reduce friction by 43% on average†, allowing skin to glide along the pillow, which can reduce pressure on creased skin Anti-bed head: Ordinary cotton pillowcases can cause hair tangling during the night In laboratory testing, slip silk has been shown to reduce friction by 43% on average† *Based on a study (clinical grading and consumer perception) of over 100 women, aged 35-65, who were regular users of cotton or synthetic (non-silk) satin pillowcases. Clinical grading showed statistically significant improvement. Individual results may vary. **Based on a survey of dermatologists in the United States conducted in April 2023.  †Compared to widely available cotton pillowcases with a 220-360 thread count. Full ingredients: Made from 100% highest grade (6A) long fiber mulberry silk with a thickness of 22 momme (with invisible zipper and piping) Care instructions: Hand wash 30°C (86°F) Machine wash 30°C (86°F) (Delicates wash bag recommended) Use a pH neutral liquid detergent Line dry in shade Iron or steam on a low heat Dry clean (No trichloroethylene) Do not bleach Do not tumble dry Imported.