That's a great question, as the terms are often used interchangeably! While they look similar on the outside, a box spring and the Helix Foundation are quite different on the inside.
A traditional box spring contains a system of coils, which were designed to work with older-style innerspring mattresses. The Helix Foundation, on the other hand, is built with a solid slatted design. This modern construction provides the rigid, even support that your foam mattress needs to perform at its best, preventing sagging and extending its life.
Think of it this way: The Helix Foundation is a modern upgrade that serves the same purpose as a box spring, but is specifically engineered to provide the perfect support for your Helix Mattress.