Best pure silk comforter will have thread count over 300. Natural grown items like the Egyptian cotton or the silk would be the best thing to be used. Since these two items are very strong and can last for years together.
Another advantage of high quality materials is that it will ensure that not only the product lasts for years together but also is immune to allergenic effects. That would be the most attractive point of your silk bed linen.
Such elements play crucial role in the designing and quality of the silk comforters and needs to be taken care of.