Castelli Climber's 4.0 Jersey

Riding in the Alps in July is a privilege reserved for only a few, but the products that emerge from it are absolutely amazing for the rest of us. We developed this jersey for hot days in the high mountains, relying on direct feedback from professionals. They wanted a jersey that keeps them cool on hot days without compromising aerodynamics. The Climber’s 4.0 jersey uses the same CFD-based seam construction as our Aero Race 7 jersey, but incorporates the most aerodynamic 3D mesh materials we could find to ensure optimal cooling. These fabrics are also particularly soft and stretchy, providing a comfortable fit that is essential for long days in the mountains. Since this jersey is designed for use under direct sunlight, we ensured that the fabric on the back blocks 90% of UV rays.