【Ergonomic Springs & Hybrid Design】14 inch hybrid mattress the contouring comfort of memory foam and the durable, bouncy feel of steel springs come together in one hybrid mattress to create our most popular mattress ever. Individually wrapped coils move independently and encased in separate pockets so they can contour precisely to your body. 10-year Warranty Guarantee: Rest easy knowing that your hybrid mattress is backed by a 10-year warranty. Our commitment to quality ensures that your mattress will provide restful sleep for years to come. For best results, we recommend allowing the mattress to fully expand for 48-72 hours after unboxing before use.