What is the mantle made of?

Could you kindly explain, what precisely is the mantle constructed from? I'm quite curious about its material composition. Is it a blend of various fabrics, or perhaps a singular, unique textile? Are there any special properties or qualities that make this mantle stand out? Additionally, how does the material contribute to the mantle's overall function and design? Your insights would be greatly appreciated as I strive to gain a deeper understanding of this fascinating garment.