Modular Base Legs are not compatible with current Sleep Number® smart bed bases. Modular base legs attach directly to a traditional Sleep Number® modular base and are used in place of a bed frame. Durable and long-lasting, they allow for convenient under-the-bed storage and make moving your bed a breeze. Modular base legs are available in 2 heights: Standard 7 1/2 inch or low profile 4 1/2 inch. Made in the USA.