Exquisite Form 5100531 Front Close Cotton Posture Bra Black 46D A completely new approach to support and comfort: the soft, wireless knit cotton cups provide great comfort and shape, and the specially designed back really makes a difference in your day. Made of cotton, nylon and spandex. Wireless, unlined (unpadded) multi-part cup is knit cotton, with an angled seam for shape. Non-stretch, breathable sheer lace across cup tops helps contain full busts. Hook-and-eye closure at front has a soft backing and coated metal hardware. See Fitter's Comments below for hook count. Sewn-on elastic underband helps support. Tall, smoothing sides and back are stretch microfiber with sewn-on elastic at upper and lower edges. Engineered, crossed elastic at center back helps improve posture and overall support. Non-adjustable straps are padded for stress relief and have sewn-on elastic at sides.