A motorcycle boot comprises a sole or tread (22), a rigid shell (20) and an upper (52) associated with the rigid shell; the upper has furthermore a base insole (54) formed by a plurality of tubular channels (56) which extend over most of the bottom surface of the sole (54) and allow the air to pass at right angles to their axis; the shell has at the front an air intake communicating with the front end of the tubular channels.