Castelli

#GIRO109 Blockhaus Short-Sleeve Jersey - Men's

What Our Gearhead® Experts Are Saying:

"I have ridden a lot of jerseys at this weight, and the Strada micromesh on the Blockhaus is genuinely one of the better moisture management fabrics I have tested. The fit is dialed without being aggressive, and the YKK Vislon zipper runs perfectly even when you are fumbling for it mid-climb. At 134 grams, it barely registers in the pocket on the way to the trailhead."

There are climbs that filter a peloton, and then there are climbs that define a race. The Blockhaus Jersey takes its name from one of the latter, a mountain that has a way of making riders prove what they are worth in real time. Castelli designed this jersey for the athletes who want to be on the right side of that equation, pairing race-level construction with a weight and fit profile that disappears once the road tilts upward and the effort begins to accumulate.

The Strada micromesh fabric is the foundation of the performance story here. It stretches in all directions to follow the body through the full range of cycling motion while its ventilated structure pulls moisture away from the skin and allows ambient air to move freely across the torso and back. At 134 grams, the jersey sits firmly in the lightweight category without sacrificing coverage or structural integrity, and the regular fit strikes a balance between aerodynamic intention and all-day wearability that makes it viable across both race days and long training rides. Raw-cut sleeve endings remove the elastic binding that tends to appear at the arm opening on heavier jerseys, keeping circulation unrestricted and comfort consistent hour after hour.

A full-length YKK Vislon zipper anchors the front closure and operates smoothly under gloves and fatigue alike, allowing fast temperature management on technical descents without requiring fine motor precision. The silicone gripper at the waist locks the hem in position through out-of-saddle efforts, preventing the jersey from untucking and disrupting aerodynamics at the moments when position matters most. Three rear pockets provide structured storage for gels, a rain layer, and a phone without creating asymmetric load or fabric distortion. For riders targeting climbing days, gran fondos, or any effort where weight and ventilation are the deciding variables, the Blockhaus Jersey is built to deliver.