4PCs flat sheet set made from mulberry silk is very soft and comfortable, suitable for skin.Silk is a natural body temperature regulator, so it is capable of absorbing and transpiring sweater or moisture, keeping you cool when it’s hot and warm when it’s cool silk sheets are not only soft against your skin but also add elegance and refined glamour to your bedroom. After a busy day, when you lie in your bed, the silky feeling will bring you a touch of luxury to a comfortable sleep night after night. a. promote sleep b. keep out the cold and constant temperature c. regulate temperature and moisture of the body d. lasting the fleeciness and comfort for a long time Very Experienced Workers. Advanced Machine and Technology. Superb Craftsmanship. Handmade silk is pure and smooth; Rod of machine manufacturing silk is relatively more, silk feel slightly bad, and filament length is less than hand-made silk. Hand washing are highly recommended. Silk washing should use neutral detergent. After soaking for 5-15 minutes in the low temperature water, rub gently and clean with clean water. Our silk pillowcases are made of 100% high quality pure natural silk - Both Sides (front and back), from raw silk material collection to processing and to finished products, each step is carefully selected. Pure silk is a natural temperature regulator which is skin-friendly and moisture to help feel cool in summer and warm in winter. It’s smooth and silky surface helps you to sleep well overnight and enjoy dreams, sleep like a baby.