The domesticated silkworm (*Bombyx mori*) is a vital economic insect in my country and the only invertebrate fully domesticated by humans to date; it is widely believed to have descended from the wild Chinese mulberry silkworm. Mulberry silk consists of long fibers with high elasticity and toughness, making it ideal for hand-stretched silk comforters. In contrast, tussah silk fibers are shorter and possess less elasticity and toughness, so machine-made silk comforters typically utilize tussah silk. Mulberry silk (and its cocoons) is naturally white and requires no chemical bleaching during comforter production, whereas tussah silk (and its cocoons) usually undergoes chemical bleaching to approximate the color and texture of mulberry silk. While mulberry silk is primarily used for apparel, tussah silk features a more complex internal structure; the fine fibers within the cocoon filaments contain microscopic voids-resulting in a porosity twice that of mulberry silk-which provide superior breathability, moisture absorption, and temperature/humidity regulation, making it highly suitable for bedding. Tussah silk fabrics, woven from tussah silk, are characterized by a soft luster, a smooth feel, excellent moisture absorption and breathability, and stable physical and chemical properties; their resistance to acids and alkalis is one to three times that of mulberry silk, and they maintain their tensile strength and elongation characteristics even at high temperatures of 160°C.
