Made for hot days in the high mountains, based on direct feedback from the pros.
The Climber's A/C W Jersey features the same CFD-based seam construction as Castelli's Aero Race 8S W Jersey, but Castelli has used the most aerodynamic 3D mesh fabrics they could find for optimal cooling. These fabrics also have a great soft and stretchy quality to them, giving this jersey a comfortable fit too, which you need for big days in the mountains. Since this jersey is meant to be used in the sun, Castelli has also made sure the fabric on the back blocks 90% of UV rays.