These silk pillowcases are made from 100% 22 momme 550 thread count silk, with both sides crafted from the same premium silk, providing smooth touching to your skin and protecting it from facial wrinkles. The pillowcase is so suitable for four seasons and can meet the needs of warm in winter and cool in summer. Convenient hidden zipper design makes it easier to put in or take out the pillow insert. The pillowcase silk is the best choice to ornament your room, create a stylish and luxurious atmosphere, improve the style of the room, and enhance your sleeping quality. Hand washing is highly recommended. Hand wash at 30℃ using a suitable cleaning agent. Hang to dry, cool iron. Size: Standard - 20x26inch / 51x66cm; Queen - 20x30inch / 51x76cm; King - 20x36inch / 51x91cm.