Flame-resistant seat, particularly air passenger seat

The seat (10) has a back part (12) and a seat part (13), whereby the back part and/or the seat part has a component made of a soft foam material which is made by foaming a reaction mixture containing polyoil, water, isocyanate, aflame-retarding material and catalyzer and the polyoil has a plant oil component between 1 and 100 percentage weight. An independent claim is also included for a method of manufacturing an inventive seat.