Seat back
"Seat back" in a Sentence (2 examples)
Another feature new to British Railways is the provision of two-position adjustable seats in the first class compartments. In this design, the seat squab can be pulled out some six inches, the seat back being attached to the seat to give a less upright sitting position.
There is an 18×27cm headrest, which at its lowest is incorporated some 5cm into the seat back.