Skate boot having a tendon guard with a recess

A skate boot (10) comprising an outer shell (12) with a heel portion (44) for receiving the heel of the foot; an ankle portion (46) for receiving the ankle, the ankle portion comprising a rear portion for facing at least partially the lower part of the Achilles tendon; and medial and lateral side portions (52; 54) for facing the medial and lateral sides of the foot respectively. The skate boot also comprises a tendon guard (43) extending upwardly from the ankle portion of the outer shell for facing at least partially the upper part of the Achilles tendon, the tendon guard comprising a recess (100) for receiving an insert (102). The tendon guard has a first flexion mode when no insert is received in the recess and a second flexion mode when the insert is received in the recess. The second flexion mode is different from the first flexion mode.