Milliard Extra Large Reading Pillow with Shredded Memory Foam, Wedge Back Rest Pillow for Sitting in Bed with Removable Velour Cover –24x18 inches (Grey)

https://www.amazon.co.uk/Milliard-Reading-Detachable-Shredded-Backrest/dp/B07CVMJQH3 this is so much better as a back rest, I use it on my sofa(which I've designed to work like a day bed situation) and I don't know how I'd sit for long periods without it