A friend of mine did something similar with a bunch of leftover poly's .....
She made dozens of wheel-chair-sized lap quits, backed them with flannel, hand lited, and donated them to the nursing home .... They have gone thru many, many washings ... The flannel backing keeps them from slipping off the laps ... and the residents LOVE them ... The more they are washed, the softer the backing becomes .....
Sad, but true: That polyester will definitely outlive the residents .....