The St. Martin is one of our luxury firm mattresses in our Signature collection, designed for sleepers who prefer strong, unyielding support. Its comfort system features a carefully balanced combination of Signature latex and Signature cooling gel, delivering excellent pressure relief while maintaining a firm, supportive feel. Beneath the comfort layers, our QuadCore® pocketed coil system with TrueEdge360™ support provides stable, edge-to-edge support that helps maintain proper alignment and long-term durability. The St. Martin offers a firm, responsive sleep surface built for consistent support night after night.