Legs apron for a motor vehicle 1, comprising: - a first part of apron comprising anchoring elements for removably anchoring the first part of apron to the motor vehicle; - a second part of apron configured to at least cover the legs of a driver of the motor vehicle; - a coupling system interposed between the first and the second part (20, 30) of apron for removably coupling the first and second part (20, 30) of apron to each other, said coupling system defining a junction line between the first and second part (20, 30) of apron when the first and second part (20, 30) of apron are coupled together; said apron comprising at least one waterproofing element (40, 50, 60, 80) arranged for waterproofing said junction line, wherein said waterproofing element (40, 50, 60, 80) comprises: a first longitudinal flap which extends from one of the first and second part (20, 30) of apron and which is adapted to overlap the junction line, characterized by a second longitudinal flap which extends from the other one of the first and second part (20,30) of apron, wherein once the second longitudinal flap is coupled to the first longitudinal flap, said first and second longitudinal flaps (50, 60) are folded along a fold line so as to achieve a labyrinth seal. - a first part of apron comprising anchoring elements for removably anchoring the first part of apron to the motor vehicle; - a second part of apron configured to at least cover the legs of a driver of the motor vehicle; - a coupling system interposed between the first and the second part (20, 30) of apron for removably coupling the first and second part (20, 30) of apron to each other, said coupling system defining a junction line between the first and second part (20, 30) of apron when the first and second part (20, 30) of apron are coupled together; said apron comprising at least one waterproofing element (40, 50, 60, 80) arranged for waterproofing said junction line, wherein said waterproofing element (40, 50, 60, 80) comprises: a first longitudinal flap which extends from one of the first and second part (20, 30) of apron and which is adapted to overlap the junction line, characterized by a second longitudinal flap which extends from the other one of the first and second part (20,30) of apron, wherein once the second longitudinal flap is coupled to the first longitudinal flap, said first and second longitudinal flaps (50, 60) are folded along a fold line so as to achieve a labyrinth seal. said apron comprising at least one waterproofing element (40, 50, 60, 80) arranged for waterproofing said junction line, wherein said waterproofing element (40, 50, 60, 80) comprises: a first longitudinal flap which extends from one of the first and second part (20, 30) of apron and which is adapted to overlap the junction line, characterized by a second longitudinal flap which extends from the other one of the first and second part (20,30) of apron, wherein once the second longitudinal flap is coupled to the first longitudinal flap, said first and second longitudinal flaps (50, 60) are folded along a fold line so as to achieve a labyrinth seal. a first longitudinal flap which extends from one of the first and second part (20, 30) of apron and which is adapted to overlap the junction line, characterized by a second longitudinal flap which extends from the other one of the first and second part (20,30) of apron, wherein once the second longitudinal flap is coupled to the first longitudinal flap, said first and second longitudinal flaps (50, 60) are folded along a fold line so as to achieve a labyrinth seal.