Does my mattress require a box spring?

No, a box spring is not required.

Our mattresses are very versatile, so most any form of support will work: platform frames, slatted frames, bunky boards, and even adjustable frames will support our mattress without requiring a box spring.

If using any form of slatted support, the space between individual slats needs to be fewer than 5”; otherwise, the mattress can start to sink through the gaps and create a feeling of sagging.

If your current setup provides enough even support based on the info above, you do not need to replace your current box spring.