The Castelli Free Aero RC Kit Bib Short is built for speed and comfort, so those of us who spends his days training and racing have a reliable kit for every trip and the rest of us ride in absolute comfort for miles on end. . High-compression Forza 2 fabric helps support vital leg muscles and seamless Progetto X² Air chamois provides cushioning for long stretches in the saddle. Uniquely designed leg holes eliminate the need for annoying silicone grips , and the 5-panel design helps reduce the number of seams so we don't face chafing.