Versus x took the pressure relief chancel concept of fiziks successful versus saddles and expanded it further with a channel design that has a smoother more ergonomically shaped profile that improves comfort and relieves the sensation of pressure versus x feature a channel width up to 30mm and depth up to 20mm for optimum pressure relief new for 2016 the foam compound is softer and the edges of the channel are more rounded aliante vs x is for the bull rigid spine if you have a relativ