Castelli endurance x2 bibshortsa short designed for long rides in the saddle features castelli famous progetto x2 air seatpad which delivers superior rider comfort as the miles roll by the newly engineered bib strap construction also is great on a wide range of body shapes castelli have engineered everything in this short to make your longest rides just a little bit more comfortable everything castelli does is geared towards speed and they know that means doing some long rides castelli sta