I LOVE nice sheets. And my current favorites are "affordable" - thick, cottony and well made - from Target! they are the "Fieldcrest Luxury" sheets. My mattress is about 19 inches deep or a bit more, and they do fit. And the flat sheet is made wide enough for the deep mattress too. I highly recommend them - I have spent much more for sheets, and nothing has come close to these! They have a very soft feel on my skin, and are not thin or crispy feeling. Love,love, love them! Tokie