ANTI AGING. ANTI SLEEP CREASE. ANTI BED HEAD.™  SLIP® IS THE #1 PREFERRED BRAND OF SILK PILLOWCASES BY DERMATOLOGISTS FOR THEIR PATIENTS, THEMSELVES, AND THEIR FAMILIES.* The beauty secret of celebrity hairstylists, dermatologists and beauty experts.™ Includes 1 x King / International Standard Pillowcase (20” x 36” | 51cm x 91cm) with invisible zipper closure | Machine washable | See care instructions for details.  This product is also available in a queen size. *Learn more