Duvet cover, semi-double, dark gray & light gray, 4-piece set x 2, 100% cotton. This is a listing for a duvet cover, fitted sheet, and pillow covers. New, unused. Tags are attached as shown in photo 10. Two sets of semi-double size 4-piece sets (1 duvet cover, 1 fitted sheet, 2 pillow covers) are included. Please check the detailed specifications yourself. Search on Amazon for "B0CRTNSHK1" or search for "KKYE duvet cover 4-piece set". Regarding the question of whether the material is a polyester blend, I am quoting directly from the product page information, so please confirm before purchasing if you are concerned. Please refrain from purchasing if you are overly sensitive. The following are the general specifications quoted from the product page: ① Duvet cover (1 piece) 170X210cm. Full-open zipper type for easy insertion and removal of the futon, and 7 inner ties to prevent slippage. ② Fitted sheet (1 piece) 120X200+30cm. Can wrap the bottom of a futon and mattress with a height of 3-25cm. ③ Pillow covers (2 pieces) 43X63cm. Even with the same size, there may be slight differences in measurement and construction depending on the manufacturer, so if you are concerned, please purchase at a physical store. There may be differences in the appearance of the actual product depending on the device used. The images are for illustrative purposes, and the actual product takes precedence. As this is an overseas product, there may be some loose stitching, slight fraying, minor scratches, or stains. Also, there may be some wrinkles or distortions in the fabric, so please only purchase if you understand this. There are multiple pieces in stock, and it seems that it will be difficult to return them to their original state if they are unfolded, so I have not checked them by unfolding them. Due to the size, it will be folded for shipping. It will be simply packaged, and will not be wrapped in bubble wrap. *There are multiple pieces in stock, so I am using the same photos, but the contents are all the same. If you have any questions, please feel free to comment.