The cycle seat with adjustable sides includes a base plate having a forward and optionally a rearward guide plate thereon. Each guide plate includes laterally adjustable left and right arm extensions, with each arm having a generally vertical wing extending upwardly therefrom. The arms of each pair simultaneously adjust inwardly and outwardly opposite one another, permitting a single adjustment to adjust both wings of a set equally. Each wing pair includes a latch mechanism, which is adjustable as the cyclist rides the cycle. The seat may be installed per se upon a bicycle or other cycle, or may be installed in combination with a longitudinal and/or arcuate and vertical adjustment mechanism for the seat. The cycle seat greatly reduces or eliminates the need for a pommel, while assuring that the seat remains in contact with the hips and/or thighs of the cyclist at all times to assure more complete control.