what is felt made of? Felt is produced by the needled punched process of many fibers. These fibers can be wool fiber, polyester fiber, viscose fiber, acrylic fiber, plant fiber and so on. The wool felt fabric is the most expensive. And polyester felt fabric is the most common. Generally Felt fabric is made of polyester fiber. These fibers are mixed and combed to form a single fiber thin mesh, which is then laid and stacked into a fiber mesh. The fiber mesh is fixed by a needle punching machine,