Medium 12" King Hybrid Mattress With Extra Lumbar Support blends a multi-media mix of foam layers and a pocket spring core to deliver a comfortable medium feel with focused lower-back support. The layer set includes a polyester cover, memory foam and PU foam for contouring, plus a pocket spring system with metal coils for responsive support and improved airflow. Made in the USA and sized as an Eastern King, it pairs with a box spring or platform bed to provide stable foundational support and help extend mattress life.