Seat/back cushion (Old Coulsdon CR5)

Purple cushion designed to fit on to, or tuck into, a chair. From a company called SpineCushion, although it doesn't provide much support other than just being a cushion. Has side ties to tie around a chair frame and a strap that can go across the back. Well used, and has a tear on one side (hopefully visible in the last photo). 45cm high x 70cm wide (at widest point, 40cm wide across back) x almost 50cm deep.