Introducing the most aerodynamic and comfortable race jersey from Castelli the Women's Aero Pro Jersey. When Castelli engineered the first aero jersey for road racing back in 2006 everyone thought they were crazy. Back then aero was only for TTs. Performance clothing meant moisture management. And you could win the Tour de France with a baggy jersey that was little more than a polyester T-shirt. Even Castelli's aerodynamic consultants expected limited gains so they named the jersey Split Second though like now they thought even small gains were worth pursuing. In the end the gains were pretty substantial and Castelli completely revolutionized the look of the pro peloton. Available in Brilliant Pink Light Black and Deep Purple the Aero Pro is a lightweight summer jersey weighing only 104g.