This Plush Underwire Casing Underwire Channeling is thick and soft and dyes like a dream. The casing is easy to apply; just stitch the edge of the channel to the seamline of the cup with a straight stitch. Then insert the wire inside the tube and stitch across the end to seal the wire inside. Pre-pressing the channel in a slight curve will help it conform to the curve of the underwire line. Plush Underwire Casing can be used for underwire insertion but is also useful to insert narrow bones as side support in a bra, waist cincher or garter belts.