Before weaving, the flannel fabric is made by dyeing wool and adding primary colors of wool through blending and weaving. It adopts twill weave and plain weave technology. At the same time, it has been milled and napped to make the knitted product soft and compact. specialty. The fabric of flannel is thicker, and the thickness and warmth of the fabric are also different. The flannel made of wool is thicker and more warm.