Seat for Vehicles with Segmented Backrest and Movable Lumbar Portion

A seat () comprises a seating surface () suitable to receive a user and a backrest () adaptable according to the user's needs. The seat further comprises a support structure () configured to connect the seat to the backrest. The backrest comprises an upper shoulder portion () and a lower lumbar portion () and the lumbar portion is movable along the support structure while the shoulder portion remains at a fixed height with respect to the support structure ().