Innerspring mattresses are constructed with a support system consisting of steel coils or springs, which are typically encased in fabric or foam padding. These coils provide the primary support and structure of the mattress, while additional layers of foam, fiber, or padding are added for comfort and cushioning. Innerspring mattresses come in various designs, including Bonnell coils, which are interconnected and hourglass-shaped, and pocketed coils, which are individually wrapped in fabric to minimize motion transfer and enhance support. They offer a responsive feel, with the coils compressing and bouncing back to support the body’s contours. Innerspring mattresses are known for their durability, breathability, and affordability, making them a popular choice for a wide range of sleepers.