Castelli Endurance 4 Bibshort

What Makes the Castelli Endurance 4 Bibshort the Right Bib for High Training Volume? The Castelli Endurance 4 Bibshort puts Castelli's top-tier Progetto X2 Air Seamless seat pad into a more accessibly priced bibshort built for the rider who logs serious weekly mileage. The pad uses a perforated next-to-skin layer for airflow, integrated padding under a seamless top sheet, and a viscous insert at the most sensitive areas, giving you the same chamois technology found in Castelli's premium Espresso line. Around the pad, an anatomic cut places seams to create an ergonomic, on-bike shape rather than a flat-standing one. The body is built from Endurance Evolution fabric, which feels soft against the skin while delivering reliable compression and effective moisture management on long rides. Mesh bib straps and back panel add ventilation through the warmest hours, and the GIRO3 leg grippers hold the hem flat against the quad without leaving a pressure ring. At 193 grams in size M and rated for 59 to 95 degrees F, this is the bib for riders who want pro-level chamois support at a price point that lets them keep more than one in the rotation.