Measurements are not accurate. I have a 20x20” cover and an 18x18” cover and bought a 21x21” insert and a 19x19” insert. Both were too small for my covers. I ended up putting the 21x21” insert into my 18x18” cover. Will be returning the 19x19” insert for a larger size to fill my 20x20” cover. Aside from that, the pillow inserts are great and the price can’t be beat!
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