To provide a sports boot which has comfortableness of excellent fitting feeling and secures a suitable combination between the outer boot and the outer shell.

The sports boot 1 comprising an outer shell 2 and the inner boot 3 into which it is inserted contains at least one opening 9, 10, 11, 25 in the outer shell and at least one projection 18, 19, 20, 21, 24 on the inner boot 2 assigned to this opening, where the opening and the projection serve to produce a positive-fit connection between the inner boot 3 and the outer shell 2. The outside of the inner boot 3 is made waterproof such that no water enters the inside of the inner boot 3, despite the presence of the openings in the outer shell 2.