The duvet should be the warmest quilt, because the main stuffing of the duvet is goose down and duck down. Compared with the two, goose down is better than duck down. In general, 50% of the cashmere is a high quality duvet. However, the permeability is almost boring. Followed by silk quilts, cashmere and wool quilts made of Australian wool. There are many kinds of silk quilts, and mulberry silk is the best. Generally, 4-6 jins of silk in winter is enough. Tussah silk is much cheaper. Wool is best to choose Australian wool, relatively slender, warm and good fit, but the price is high. Again cotton and chemical fiber.