We reach for the GIRO109 Competizione 4 Short-Sleeve Jersey when the ride calls for versatility—whether it's a steady training day or a fast-moving group effort. Castelli designs this jersey to balance comfort and performance, so we can focus on the road ahead instead of what we're wearing. The all-over stretch fabric adapts to our movement, creating an ergonomic fit that feels natural in the riding position. Raw-cut sleeves provide a clean, low-profile finish, while the full-length YKK Vislon zipper makes it easy to regulate airflow as conditions change. A silicone gripper at the waist keeps the jersey in place, and three rear pockets offer convenient storage for everything we need on the ride.