New V-Shape base paired with a wider tip and larger seating area improve comfort and overall performance Variable density foams throughout further improve long term comfort and reduce pressure especially while in an aerodynamic position PAS - features a channel in the seat to alleviate pressure and numbness in the pelvic region by promoting healthy perineal blood flow Nack models feature a Nano Carbon composite rail paired with reinforced seat clamp area for the perfect fusion of performance and reliability Tirox model features an aerospace light Ti-Alloy rail that provides a balance of weight and strength Triathlon Nack Grey/Black 245mmx143mm 181g UnisexUPC/EAN/GTIN: 4711946192501