Mattresses arent the only important part of your bed; you also need the right foundation. The Sleepys Universal Box Spring is a strong steel foundation for a quiet nights sleep. The steel construction is quieter and stronger than all-wood alternatives, making it the perfect choice for your new bed. Available in two height options; five inch low-profile and nine inch high-profile, the Semi Flex will also give you a great foundation for your bed. The design has tailored corners and a neutral color that add to the visual appeal of the unit. It passes all durability tests; including Cornell, Rollator, and Impact, making it a lasting staple in your bedroom for years to come.Dimensions: Twin: 39 W x 75 L Twin XL: 39 W x 80 L Full: 54 W x 75 L Full XL: 54 W x 80 L Queen: 60 W x 80 L King: 76 W x 80 L Cal King: 72 W x 84 L.Sleepys Warranty.