In trying to get my elderly mother to buy a new mattress, I discovered they sell sheet sets as well. Boy are they great sheets if you have a pillow-top mattress. They are 100% cotton, and they have strong elastic straps for each corner. They do not pop off the corners like my old sheets did. They’re the first sheets that actually fit the depth of the mattress. They are made by Dream Fit and only come in neutral colors(white and ivory). A full set is $ 70. I highly recommend them if you’ve struggled to find sheets that work well with a thick mattress. The staff has been very helpful, as well.