making it exceptionally stylish

chasing KOM’s

The application of the ENTRANT™ fabric

Reflective band on left leg

improving speed in every way

CASTELLI x BLACKSMITH Women's Jersey soft goods making it exceptionally stylishDescription Designed by Blacksmith, made by Castelli. When Castelli engineered the first aero jersey for road racing back in 2006, everyone thought we 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 our aerodynamic consultants expected limited gains, so we named the jersey Split Second, though, like