This vest is made of velvet. All right. Derong: The acrylic fiber produced by Derong Company is more fluffy than ordinary acrylic fiber, so it has better warmth retention. Delong fabric is a new type of fabric and a functional fabric. Its products are bright in color, as dazzling as diamonds, and feel good, so it is called diamond velvet. Generally speaking, it is better to combine velvet with warmth and comfort.