Castelli Climber's 4.0 Jersey

Racing in the Alps in July may only be the preserve of a select few, but the products that come out of it are absolutely amazing for the rest of us. We developed this jersey for hot days in the high mountains based on direct feedback from the pros. They wanted a jersey that would keep 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 utilises the most aerodynamic 3D mesh materials we could find to ensure optimal cooling performance. These fabrics are also particularly soft and stretchy, giving the jersey a comfortable fit that is essential for long days in the mountains. And because this jersey is designed for use in the blazing sun, we've made sure that the fabric on the back blocks 90% of UV rays.