With its three-stage lumbar support adjustment and multi-angle and height adjustments for the seat back and seat height, racing seat production technology offers the spine comfortable and ideal support. -High-density foam for memory -The rocking chair feature -4D Armrest A class 4 gas lift with SGS certification and a metal frame design that increases loading capacity -Wider metal five-star base: improve balance in general -Constructed from premium car PU leather that breathes