Your Entry to Real On-the-Bike Comfort While these shorts sit at the entry level of Castelli’s range, they're engineered with top-level performance. It starts with the ProDry 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 Air seat pad is the choice of some of Castelli's pro athletes and even sees duty at the Tour de France. Read more… Consider this not as an entry level product but as your entry to real on the bike comfort. KissAir Seat Pad The kiss Air seat pad aims to incorporate as many of the features and comfort as the top-of-the-line progetto x2 seat pad but at a more affordable price. 1. Seamless skin care layer: A super soft, brushed microfibre top that maximizes comfort and fit. Seamlessly engineered to eliminate chafing and abrasion. Flexible to move with you. Bacteriostatic treatment to avoid saddle sores and infection. 2. Continuously variable thickness: Dual density and infinitely variable thickness gives you the perfect cushioning for every part of the pad. Maximum thickness and density in the ischial zone, tapering to moderate thickness in the perineum, and minimum thickness at the perimeter. 3. Anatomic shape: Comfort is further enhanced by creating a perfect interface to your body during every pedal stroke.