According to the product size chart, I purchased 20" square pillow inserts to use in my 18" square Christmas pillowcase. They fit perfectly and are hypoallergenic (bonus)! The inserts are very soft, so you sink into the pillows. I've included a few photos, but if you want to see more, you can find the video on YouTube's "Home (Tour) for the Holidays" on Shawna Who. I highly recommend these pillow inserts.
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