Available sizes vary by listing. Examples include body pillow covers (~54.0" x 20.0"), rectangular cases around 20" x 40" and 21" x 30", options near 32" x 21", square 18" x 18", and intermediate listings such as 21" x 36+4" and 21" x 32".
Care varies by item, but most listings recommend machine washing and tumble drying. A few specify spot or wipe clean only, and one soft-finish listing notes machine wash cold and tumble dry low.
Labeling varies across listings. Some items are explicitly marked King or Standard (one listing mentions a 20" x 40" king), one pair is described as a standard size that fits both standard and queen pillows, and longer covers are sold as body pillow cases designed to fit most standard body pillows.
Closures vary by product: zipper closures, 4" inner-envelope closures, side-envelope closures, and some listings do not specify a closure.