There has been a long-standing interest in silks and their cocoons. In the late 19th and early 20th century, the biologists focused on the behaviour of different silkworms and the appearance of cocoons produced. Nowadays, silk fibres have been studied as an engineering fibre and used to make artificial composites mainly for medical use [3], [4], [5] and [6]. However, without understanding the biophysics of the cocoon structure and the role of silk fibres in it, it is unlikely to be either effective or constructive to produce a silk composite simply by inserting silk fibres into man-made resins.