※The stain came out after washing! This is a flat-head prevention pillow. It has strings on the top and sides to adjust the height. It has both cotton and mesh sides, so you can flip it over depending on the season. The main body can be washed, but a pillow cover is included if you're concerned. I bought it on Rakuten. If you want to know more, I'll give you the product number so you can check it. My child liked to sleep on their stomach, so I only used it a few times. I think it's a very good product for babies who sleep on their backs.