100% Microfiber Polyester???TOP QUALITY 1800TC MATERIALS??Designed with simple sophistication, combined with BST Brushed Microfiber, the new 1800 High Thread Count materials are even thinner than most luxurious natural fibers such as silk. This makes the bedding more softer, breathable, comfortable that keep you warm during winter and cool during summer. Light touching feeling , DEFINTLY breathable cool and exceptional strength, gives you and your family the BSBEST Sleep environment all night.???CUSTOMER CENTERED DESIGN??Compared to the normal 4-piece bed sheet set, our 6 Piece Sheet set includes 1 flat sheet 102×105, 1 fitted sheet 78×80,and 4 pillowcases 20×40. Considering that our customer may have needs on regularly cleaning old pillowcase or readying for the guest room,we added two extra pillowcases for your money SAVING. No worry of alternative pillowcase being not available again.???FITTED SHEET STYLE??Easily stretch up to 13-16inch. With Exquisite deep pocket design, stretch skirt has a thick, 130GSM full-length elastic pulls the corners snugly for a smooth fit on most mattress types, the sheet will keep neat all the time, will not change the position of mattress.???CARE INSTRUCTION??OUR sheets, readily capable of being washed and dried wonderfully at home, more durable than cotton after 100 times machine washing tests, easy maintenance. Fade, stain, shrink and wrinkle resistant. No pilling or shedding. Simply use cold water. Dries quick on tumble dry low.???GUARANTEED 5-STAR EXPERIENCE??Our products can only be packed and shipped after strict quality inspection. If you are not satisfied, simply contact us to return the item for a refund. We are so confident you will love our products like our other 5-star reviewers! You will be amazed at the customer service you receive after the sale!