Castelli's Premio Black Bibshort is designed for comfort over long distances, support, and durability. We like that this bibshort is engineered for speed and that the woven fabrics used weigh 30-percent less than comparable knit fabrics. A perforated back bib panel provides breathability with straps that don't bind at the shoulders, and integrated gripper elastic at the leg holds everything in place. The Progetto X2 Air Seamless seat pad only adds to the comfort these bibs provide while we're in the saddle.