Fizik arione vs kium saddlethe vs saddle design has a 7mm channel in the centre for relieving pressure keeping your ride comfortable whilst still being stiff and durable the solid base of the saddle keeps the saddles structural integrity in place as the relief channel spans the entire length of the saddle platform arione vs is for the snake flexible spine if you are very spinally flexible far less than 90 degrees between your straight legs and your back when bending over as far as you can