Material: Satin pillowcases are made of 100% satin polyester fabric, which is soft, silky, and more durable than silk pillowcases, providing a luxurious and radiant feel at an affordable price Compared with silk and cotton pillowcases, satin pillowcases are cool in summer and warm in winter; thinner than cotton, reducing friction on hair, preventing breakage, tangling and split ends; also less absorbent than silk, which can keep hair shiny and skin moisturized overnight; these pillowcases are the perfect Mother's Day gift for mom to keep her skin hydrated Size: 51cm x 76cm; 2 sets Easy to clean: The zipperless envelope design is simple and stylish, while making it easy to put in or take out the pillow; machine wash in cold water, gentle cycle, tumble dry low, cold iron when necessary; do not bleach Multiple colors: Available in a variety of colors to match any bedding; uses a unique dyeing technology to prevent fading