When every second matters we reach for the Castelli Sanremo BTW Speed Suit to take our performance to the next level. featuring a highly aerodynamic design, the Castelli Sanremo BTW Speed Suit is a one-piece speed suit that optimizes our efficiency, speed, and comfort on the bike. The stretchy and lightweight fabric is designed to be ultra-aerodynamic and breathable, so we stay comfortable as we are competing. The Progetto Air X2 Seamless chamois pad cushions our rear during long days in the saddle, and the stretchy sleeves with raw-cut edges make for a super comfortable fit.