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The special SpeedGRIP Compound adds features of mechanical resistance and chemical grip
helping to maintain your optimum body temperature and keep you dry
The thin SUPtraction® rubber sole offers excellent grip
Crafted with precision and passion in the USA
This top-class road shoe combines efficiency with comfort
CASTELLI x BLACKSMITH Women's Jersey shoes The special SpeedGRIP Compound addsDescription 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