The flippable Plank Luxe Hybrid is designed to be the firmest mattress on the market—pairing all of the benefits of the original Plank with the additional responsiveness and pressure point relief of individually encased coils. Put simply, the hybrid construction of the Plank Luxe Hybrid creates a more comfortable sleep surface for both sleep partners. Both the firm and extra firm sides are offered with optional cooling panels for the ultimate sleep experience.