<P> Bra components, including the cup top and bottom (if seamed), the central, side and back panels, and straps, are cut to manufacturer's specifications . Many layers of fabric may be cut at the same time using computer - controlled lasers or bandsaw shearing devices . The pieces are assembled by piece workers using industrial sewing machines or automated machines . Coated metal hooks and eyes are sewn in by machine and heat processed or ironed into the back ends of the band and a tag or label is attached or printed onto the bra itself . The completed bras are folded (mechanically or manually), and packaged for shipment . </P> <P> The chest band and cups, not the shoulder straps, are designed to support the weight of women's breasts . Strapless bras rely on an underwire and additional seaming and stiffening panels to support them . The shoulder straps of some sports bras cross over at the back to take the pressure off the shoulders when arms are raised . Manufacturers continually experiment with proprietary frame designs . For example, the Playtex "18 - Hour Bra" model utilizes an M - Frame design . </P> <P> Bras were originally made of linen, cotton broadcloth, and twill weaves and sewn using flat - felled or bias - tape seams . They are now made of a variety of materials, including Tricot, Spandex, Spanette, Latex, microfiber, satin, Jacquard, foam, mesh, and lace, which are blended to achieve specific purposes . Spandex, a synthetic fiber with built - in "stretch memory", can be blended with cotton, polyester, or nylon . Mesh is a high - tech synthetic composed of ultra-fine filaments that are tightly knit for smoothness . </P> <P> Sixty to seventy percent of bras sold in the UK and US have underwired cups . The underwire is made of metal, plastic, or resin . Underwire is built around the perimeter of the cup where it attaches to the band, increasing its rigidity to improve support, lift, and separation . </P>

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