Amazon.com.au:Customer reviews: Foamily Premium Outdoor Water and Mold Resistant Hypoallergenic Stuffer Pillow Throw Inserts Sham Square Form Polyester Pillows, Standard/White - Made in USA Parent, Outdoor Liner, White, 18" x 18"
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While the vendor accepted my return & offered to replace, I chose not to. The 18X18 pillow did not have enough stuffing to fill out the water resistant cover, much less my pillow cover. I gave the additional "star" making "2" because they positively handled the problem. (I fluffed & fluffed & allowed to set for a week+ to overcome shipping compression, but it did not work.)
I purchased these two pillows to use outdoors with some pillow covers I purchased from Amazon. As some of the reviews (that I ignored) stated, these are not the correct size. I was hoping that they would fluff and get bigger after being left out a day or so, but this did not happen. They are too small for a 18x18 pillow cover because there is no fluff in the corners so it looks like a deflated raft. I would heed the warnings (which I did not) and not purchase this item. They are available from other stores for better quality and less expensive.
The manufacturer’s recommendation to order up a size is a great way to get people to spend more money rather than filling the pillow to specs for better quality. If you choose to order the same size insert for your pillow, be prepared to use two of these to make one “decent” pillow.