We are in the process of getting patio furniture but  I desperately needed something until we picked better furniture. The width of the chair bottom  19w x 17.5 d and these cushions are 19x19 and they work.  They are comfortable but they are 5inches thick and it gives plenty of padding and support in a plastic chair.   I plan to go with a teal/turquoise theme in the back yard so the grey will go perfectly.   They did get caught in the rain for a little while but dried quickly and didn’t lose their shape. Very pleased.