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 Do I need a mattress protector? How do I clean the cover? Does Brooklyn Bedding offer custom sizes? Is the mattress protector a full encasement? Will the mattress protector reduce breathability of the mattress?