Instead of creating and applying a design to the exterior of the fabric or using colored panels, Castell created a performance jacquard-knit fabric. The raised relief, same color graphics are part of the fabric, and offer a distinctive, attractive look. Developing the fabric took time and iteration, as the designers weren't willing to compromise fit, stretch, moisture management or comfort. It still feels like a superior Castelli jersey against the skin, which is crucial in all ways, but has a unique look and visual experience.

Beyond the fabric, the team finished the Promessa Jacquard Jersey with thoughtful design touches like the collar that tapers to the zipper, Castelli's rear drop-pocket design with reflective piping, and a raw-cut elastic sleeve ending that list flat and comfortable, with a stretch mesh fabric is secures comfortably, without pinching or excessive pressure. A YKK Camlock zipper with a tag pull makes manual adjustment easy and the wider, visible zipper looks appropriate and complementary to the graphic design. Castelli's custom jacquard fabric gives cycling jerseys a new look without compromising on performance or comfort and this Promessa version is sure to be popular with many cyclists seeking performance and style in an otherwise subtle design.