The Thunder Bay is a luxury firm mattress designed for sleepers who want strong, consistent support with just the right amount of built-in comfort. It begins with our QuadCore® pocketed coil system with TrueEdge360™ support, providing stable, edge-to-edge support that resists sagging and helps maintain proper alignment over time. The comfort system features our Signature hypoallergenic zoned latex, carefully engineered to support the back and spine while relieving pressure where it’s needed most. The result is a firm, responsive sleep surface that feels supportive, refined, and comfortable night after night.