Seat assemblies and methods for fabricating seat assemblies are provided. In one example, a seat assembly includes a seat frame and a seat cushion that is supported by the seat frame. The seat cushion includes a modular foam arrangement including a first modular foam section having a first interlocking feature and a second modular foam section having a second interlocking feature engaged with the first interlocking feature. An outer covering at least partially covers the modular foam arrangement.