Castelli Aero Race 8S Short Sleeve Jersey More efficiency. More speed. The Castelli Aero Race 8S Short Sleeve Jersey is focused on saving you precious watts. When the decisive moments of a race kick off you can be confident you're not wasting power at the pointy end of proceedings. With 80% of drag coming from the body, the Aero Race 8S is engineered to be as slippery through the air as possible. Computational fluid dynamics (CFD) has allowed Castelli to place the sleeve seams precisely to reduce drag as speeds increase. The shoulder fabric also contributes to drag reduction, with Castelli...