Castelli ar jersey full zipcastelli introduced its aero race jersey in 2007 and has been continuously improving it since the free ar 4 0 full zip jersey re defines all expectations the aero race jersey is both aerodynamic and race ready the two characteristics go hand in hand so castelli constructed the majority of the jersey from its velocity dry fabric this material is renowned for its quick drying properties and overall light weight around 131 grams for the entire jersey additionally