Castelli free ar 41 jersey kit versionthis free ar 41 jersey is an advancement of castellis pro racing jersey from a few years ago and also their first aerodynamic race jersey not to get retired once the new generation of faster more aerodynamic jerseys were developed the previous version of this jersey the aero race 40 was very quick but also had a remarkable mix of classic exquisiteness and a flexible fit that worked on various body types not just the slim racer as for this version