Swim fin (1) comprising a foot portion (2) intended to accommodate and be attached to a user's foot, which foot portion (2) embraces at least one toe portion (3) having a foot sole, at least one arm (4), which is attached to the foot portion (2) and which projects forward, and at least one blade (5), the at least one blade (5) being limitedly pivotally attached to the arm (4). The arm (4) is rigidly attached to at least the toe portion (2) while forming an angle (α) defined as the angle between the foot sole and the axial direction of the arm (4), which angle amounts to between approx. 20 and 60°, and that the arm is rigid.