Engineered for performance. While this short sits at the entry level of CASTELLI's short range, is is engineered with top-level performance. It starts witht the Pro Dry Soft two layer fabric that knits a polyester inner layer with a nylon outer layer for exceptional moisture management and durability. Then the side panel and leg ending are extra stretchy for exceptional fit. The KISS Air² seat pad is the choice of some of our pro athletes and even sees duty at the Tour de France. Consider this short not as an entry-level but as your entry to real comfort.