【Upgraded Pocketed Coils for Enhanced Support】 Our king hybrid mattress adopts fully upgraded pocketed coils with thicker wire gauge and more coil units, offering 30% firmer support compared to ordinary innerspring mattresses. Boasting outstanding anti-sag performance and long-lasting sturdiness, it effectively avoids mattress sinking and maintains stable firmness year after year. The boosted supportive power perfectly fits heavy-weight sleepers, holds body weight evenly without collapse, and stays in great shape for lasting comfortable rest.