This superking duvet set is the first weve ever found that combines the easy care of polycotton with the luxury of such a high thread count all other similar bed linen we know of is 100 cotton meaning it tends to crease in the wash and who wants to spend their time wrestling on the ironing board with a massive duvet cover this duvet set is woven in 70 cotton with 30 polyester to help prevent creasing and has a 1000 thread count thats an amazing 1000 threads per square inch the silk