The fizik arione versus x saddle combines the spine concept with fizik39s technology to bring you a saddle that features a deeper pressure relief channel design compared the to original versus saddles for maximum pressure relief when riding the road bike saddle featrues a 20mm deep channel which has a great pressure relief but also maintains the stiffness and durability of a solid base saddle whereas other cut out saddles have been known to sag because they have a weaker base structure th