Dimension NDR features the same overall shape as the standard dimension saddles with 3mm of extra padding and side protectors to avoid scratches and abrasions when the going get a little too tough. Dimension saddles feature a redesigned overall shape with shorter nose made to be more comfortable for both men and women riders by spreading pressure areas more evenly - especially in an aero position. The increased 143mm width helps to distribute the weight of the athletes on a larger surface ensuring greater comfort for long rides. Nack models feature a Nano Carbon composite rail paired with reinforced seat clamp area for the perfect fusion of performance and reliability. PAS - features a channel in the seat to alleviate pressure and numbness in the pelvic region by promoting healthy perineal blood flow. CPC Models feature material on top of the saddle that provides higher grip better airflow and vibration absorption. Carbon injection monocoque base