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 Queen / International Standard Pillowcase (20” x 30” | 51cm x 76cm) with invisible zipper closure | Machine washable | See care instructions for details. This product is also available in a king size. *Learn more