Castelli Size Chart The favorite Aero Race 4.1 Jersey in dyed fabric rather than the usual sublimation printing. This gives deeper, more saturated colors while avoiding the shiny look that inevitably comes from the high heat and pressure of sublimation printing. You still get the great fit, great comfort, great moisture management and great aero performance from the race background of this jersey. Look smart; go fast. Features: - Saves approximately 12 watts at 40 km/h compared to a normal race-fit jersey - Velocity dimpled fabric on front and shoulders for improved wicking and faster drying - Full-length YKK(R) Vislon(R) zipper with neck protector - Nervato fabric at armholes for improved aerodynamics - Silicone gripper elastic at waist - Mesh raw-edge arm grippers - Zippered rear pocket - Reflective heat-transfer viz strips - 18deg-32degC / 65deg-90degF - Weight: 123g