Everything in the castelli endurance x2 bib short is engineered to make your longest rides just a little bit more comfortable everything castelli does is geared toward speed and they know that means doing some long rides castelli stay with the proven comfort of their progetto x2 air seat pad use new endurance evolution fabric for muscle support and give the short a perfect eight panel anatomic fit and the giro3 leg gripper of particular note is the bib construction which theyve engineere