Review on Bare Home Flannel Standard Pillowcases Set of 2: Velvety Soft & Cozy Grey Cotton Bedsheets by Carl Movahed

The bulleted list specifically states (or will state if removed after this review) that these pillowcases have an envelope. This means the open end of the pillowcase must have a flap covering the end of the pillow so it fits inside the pillowcase and doesn't slip out. I'm not sure if the company means "envelope" but that's what they always had in mind when it came to pillowcases. I don't know of a standard size, but king size pillowcases definitely don't have an envelope. Flannel feels thick, soft and warm. I haven't washed them so I don't know how they hold up to washing and drying. I was specifically looking for large flannel pillowcases. I hope this helps a future buyer who is looking for an envelope in the sense that it is meant to be, as it is not.