Aidon shaping - short-nosed cushioned saddle designed for pedal-assisted bikes X1 shell - compliant ride compliant fibre reinforced nylon shell and a carbon rail system X1 mobius rail - closed loop carbon rail design for added strength and weight distribution Wingflex - The shell's side edges flex and adapt to a rider's inner leg movement Type 2 foam - Progressive cushioning with a lower compression modulus. Dimensions: 255x145mm. Weight 205g