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. Carbon injection monocoque base