Abstract: A seat for a vehicle includes a seat frame having a major middle portion made of a resin, at least a part of the major middle portion having a net structure. A covering member for covering the major middle portion is detachably engaged with the seat frame such that, when the covering member is detached from the seat frame, at least a part of the net structure of the seat frame is exposed, thereby producing a ventilation. During the summer season the covering member can be detached from the major middle portion thereby providing high ventilation for the seat, while during the winter season the covering member can be engaged with the major middle portion thereby providing a high heat retaining property for the seat.

Abstract: A pair of first and second front leg members support a seat cushion on the floor. Each of the first and second front leg members is fixed to the floor. A third rear leg member for supporting the seat cushion is fixed to the seat cushion. A pair of first and second seat slide mechanisms for allowing the seat cushion to slide relative to the floor each has (1) a lower rail fixed to one of the first and second front leg members and (2) an upper rail fixed to the seat cushion. A third seat slide mechanism allows the third rear leg member to move relative to the floor.