{companyName} knows that flannel is defined by the &quot;nap&quot;—the mechanical brushing of the cotton fibers. Being Flannel Shirts Manufacturers in Sialkot means managing the balance between surface softness and the structural integrity of the weave. If you over-brush, the fabric weakens; if you under-brush, it feels like basic canvas. We focus on the micron-depth of the metal brushes to ensure the cotton traps heat without losing its tensile strength.