PROLOGO ZERO II PAS TIROX 134 BLACKFlat profile saddle intended for road use Carbon fiber injection base Tirox models feature an aerospace light Ti Alloy rail that provides a balance of weight and strength PAS models feature a channel in the seat to alleviate pressure and numbness in the pelvic region by promoting healthy perineal blood flow T2. 0 models feature Chromium HRC39, a lightweight aerospace grade material that makes for the strongest of all Prologo rails