A square pillow typically measuring 26" x 26" used for decorative purposes on a bed or for lumbar support on a sofa or couch. When used a on bed they are placed behind your standard, queen and king sized sleep pillows and used with a euro sham. When used on a sofa they are usually placed in the corners when not in use. But, when needed, placed behind the back for lumbar support or so the sofa doesn't sit so deep. They are, in my opinion the most versitile pillow anyone can buy.
26" x 26" is the typical size used when referencing a Euro pillow. However, when referenced in other square dimensions they are more commonly refereed to as decortive pillows. Euro pillows will need a covering called a Euro sham that ironically needs to have a internal dimension slightly smaller so the Euro pillow fills the Euro sham properly.
Stateside they are used for decorative purposes on the bed while being used for lumbar support on the sofa or couch. Our European counter parts typically use them for sleeping.
Because they are amazingly flexible. They can be used in so many ways, from the bedroom to the living room. They are great for sitting up in bed and being fully supported all the way up to your shoulders while leaning against the headboard. They are great for lounging around on the sofa when you want to prop your feet up after a long day at the office or for laying or your side while watching your favorite streaming service. They are so flexible and so very comfortable that once you have them you wil wonder how you went so long without them.
A Euro sham is a decorative covering for a 26" x 26" euro pillow. The sky is the limit when it comes to Euro shams. They can be styled like a pillow case or hemstitched with scallops around the perimeter for the ultimate in luxury.