My pillow shams measure 26 x 26 but in hopes of obtaining a full look, opted to try these 28 x 28 Euro Pillows. They filled them completely corner to corner without overfilling resulting in the pillow showing or bulging out of the back insert pockets. I am very pleased with this purchase and the appearance of my daybed pillows. If you have similar needs, you won't regret this purchase. The smaller pillows sized the same as the shams would not have filled them to capacity and would have resulted in disappointment.