The Mackinac is designed for sleepers who prefer an extra-firm, supportive mattress. It features our QuadCore® pocketed coil system with TrueEdge360™ support, providing stable, edge-to-edge support and long-lasting durability for a firm, consistent sleep surface. The comfort system includes two layers of ultra-premium extra-firm foam combined with premium firm quilting, creating one of the firmest-feeling mattresses in our Signature collection. The Mackinac delivers strong, reliable support without compromising quality, making it ideal for those who value a very firm sleeping surface.