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What Fabric Is Flannel? A Clear Guide to Its Feel and Uses TL;DR: Flannel is a woven fabric made soft and fuzzy by a mechanical napping process. Its defining feature is the finishing method, not the fiber content, and it can be made from wool, cotton, or synthetic blends. Flannel is popular for warm clothing, bedding, and quilts due to its weight and softness. Flannel is defined as a woven fabric with a napped surface, meaning its fibers are mechanically brushed to create the soft, fuzzy texture it is known for. What fabric is flannel comes down to one key fact: flannel is identified by …