The Monarch Box Spring is a super strong Metal Foundation designed to deliver a quiet night's sleep. The Metal construction is quieter and stronger than all-wood alternatives, making it a perfect choice for your new Purple Mattress. Available in two height options; 9 inch high profile and 5 inch low profile, the Semi-Flex provides a great foundation for your bed. This design with matching waterfall tailoring and a non-skid self deck creates great visual appeal as well as functionality to keep your mattress from sliding. It passes all durability tests making it a staple in your bedroom for years to come.