The Castelli Climber's A/C Jersey was born from the demands of pro riders racing in the searing heat of the Alps, and it delivers elite-level performance for any rider tackling summer conditions. Designed for the hottest days when staying cool matters just as much as staying fast, this jersey combines CFD-based seam placement with ultra-lightweight 3D mesh fabrics to maximize airflow and aerodynamics. The front features Flusso 3D fabric for rapid cooling, while the back uses StradaPro 3D to enhance breathability and block over 90% of UV rays. Despite its technical performance, the materials offer a soft, stretchy feel for lasting comfort on long climbs or intense summer rides.

The Climber’s A/C Jersey also features elbow-length stretch sleeves with raw-cut edges for a sleek, aerodynamic finish, and airflow shoulder construction for enhanced ventilation at race speeds. A low-profile elastic waistband keeps the jersey securely in place while supporting the rear pockets, even when fully loaded. The full-length YKK® Vislon® zipper ensures easy ventilation control on the fly. Weighing just 165g and optimized for temperatures between 22°C and 40°C (71°F to 104°F), this race-fit jersey is the go-to choice for high-output efforts in the heat — or layered with a base layer for versatile, three-season performance.