Flannel has a clean and generous color and is divided into light gray, medium gray, and dark gray. It is suitable for making men's and women's tops and trousers in spring and autumn. The flannel has a high weight, the fleece is more delicate and dense, the fabric is thick, the cost is high, and the heat retention it is good.
The flannel surface is covered with a layer of plump and fine fluff, without weaving, and feels soft and flat, with a thinner body than Melton. After shrinking and raising, it feels plump and fine suede.
The production of flannel is to dye some wool (or cotton fibers) first, then blend a part of the original color wool (or cotton fibers), mix and spin into a mixed-color wool yarn, and weave the fabric into a fleece and a brushed finish. Most use twill weave, but also plain weave. In addition to the whole wool (or pure cotton), the raw materials used are generally wool (or cotton) viscose blends, and some are mixed with a small amount of nylon fibers to improve wear resistance.