We manufacture our Murphy beds to accommodate three industry standard size mattresses; Queen, Full (sometimes referred to as Double), and Twin (sometimes referred to as Single). Every Murphy bed from National Casegoods starts from a solid wood platform frame that gives your innerspring mattress the sturdy base it needs to properly support your body. The Murphy bed cabinet is designed to accommodate any standard innerspring mattress, as long as it does not exceed 12 inches in total thickness. With a mattress of proper thickness, bed linens can remain in place when the Murphy bed is closed. However, we do recommend removing any pillows or other bulky bedding prior to closing the bed.