Mattresses aren't the only important part of your bed; you also need the right foundation. The Sleepy's Universal Box Spring is a strong steel foundation for a quiet night's 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.