This is for the COVER ONLY. You will need to get a 20 x 20 pillow insert to have it look full as pictured.
The cover itself is 18 x 18 with an zipper to insert and remove the pillow for washing.
Grab the matching cover: https://lilbowpeepetc.com/collections/pillow-covers/products/we-had-sex-here-18-x-18-linen-pillow-cover