Gorgeous bedding, light and pleasantly soft. The microfiber is indeed of 100% polyester - has much better properties than cotton, for example, it gives the moisture off quickly, so you never feel to rest in the damp bedding. (It's ok to google). I will replace the next due Tree Woolen bedding again by microfibre underwear. After washing the bedding is also super fast drying and ironing is unnecessary annoying anyway. I am just thrilled.