logo_horizontal shopping-cart info icon Affirm

Box Foundation

Everything you need and nothing you don’t. This foundation provides support, height, and airflow for your T&N or Mint Mattress. Free shipping and returns.

King and Cal King sizes ship in 4 – 10 business days. All other sizes ship in 2 – 7 business days.

This foundation can be used with most frames or metal bases.

Select a size:



    Oh no! Our customers loved this product too much. Join our waitlist to get notified when it's back in stock!
    Join Waitlist

    5-Year Warranty

    100-Night Sleep Trial

    Ships To Your Door

    Our Answer To The Box Spring

    Whether you’re looking for a partner for your metal base, or a little added height, this box foundation has you covered.

    Tool-less Assembly

    Ships to your door in a convenient box and assembles in minutes.

    The Perfect Height

    At 7 1/4 inches, this foundation adds the perfect lift when you need some extra height.

    Durable Cover

    Our foundation is covered in a long-lasting, stone grey woven fabric.

    Product Details

    Made of wooden side rails, middle panel and slats, this foundation is covered in a durable 100% Polyester woven fabric. The slats are covered in non-skid fabric to prevent your mattress from sliding around.

    • Align locking blocks in each of the four corners.
    • Insert lock pins into each of the four locking blocks, pushing firmly to ensure proper alignment.
    • Line up each end of the center rail with the corresponding tapered slide connector and firmly push down into place, making sure the “Up Arrow” faces upward.
    • Start one end of each support slat pack against the head/food board, with the hook side facing down to firmly catch the loop material on each side rail. Unroll the slat packs toward the center fully extending them.

    Before you buy...

    12 things you should consider

    READ NOW No Thank You