Do your sheets work on a mattress over 11" thick? April 20, 2022 13:45 Updated Yes, our sheets are designed to fit mattresses with a thickness from 11" to 14". Related articles Can I adjust the firmness of the premium shredded foam pillow? Does Brooklyn Bedding offer custom sizes? Do I need a mattress protector? How do I select the right firmness for my mattress? How do I move the box?