** FITTED SHEETS: Please note that mattress depths vary widely by manufacturer. Measure the depth of your mattress before purchasing sheets. Standard and older mattresses average 9-12", while newer pillow-top mattresses are 14-16" deep and up. These deeper mattresses will require additional depth in fitted sheets. FLAT SHEETS: If you own an extra-deep mattress, be aware of flat sheet sizes as well. Choose the largest sizes available so there will be an adequate length to tuck in at least 8-12" underneath the end of the bed. In some cases it may be necessary to purchase the next size up (a queen flat sheet for a double bed, etc.), in order to cover the deeper mattress.

+ The dimensions of flat sheets vary somewhat in width and length by manufacturer. The + denotes that some manufacturers offer sheets with a few added inches. Look for these to use on the larger, pillow-top mattresses.