Fizik arione vsx kium saddleverus x collection is meant for those conumers that have been asking fizik for a model with a relief zone versus x includes a complete range of saddles that combines the spine concept fizik technology and new consumers needsa 20mm deep channel design allows a greater pressure relief maintaing the stiffness and durability of a solid base saddle features channelsilver microtex with reflective thermowelded film shellnylon carbon reinforced railkium paddin