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What is Flannel? Understanding Its Fabric and Uses Flannel is everywhere from your favorite winter shirt to plush bedding that feels like a warm hug on a cold morning. Most people think flannel is simply about softness and warmth, nothing more. Yet the secret lies in its structure. Flannel’s napped finish traps tiny air pockets, turning a single layer into an unexpected heat shield that can rival bulkier fabrics. That’s just one reason this fabric has stayed popular for centuries and there’s a lot more beneath the surface than you might expect. Table of Contents Defining Flannel: Material An …