Our open-ended design fits over most standard, queen, and king pillows and pillowcases. 100% Silk Charmeuse Front (19 Momme) 95% Rayon 5% Spandex Non-slip back. Long term beauty sleep investment with major benefits: A perfect travel essential for covering your pillow while traveling. Prevents bedhead, hair breakage, dry and frizzy hair. Hypo-allergenic, prevents skin creases, fine lines, and skin irritations. Silk's natural proteins and 18 amino acids have added anti-aging benefits.