Traditional King Mattress Medium firm Mattress for Universal Sleep Positions Tight Top Bed Mattress with High Density CertiPUR-US Certified Foam Padding 8' Pocket Spring Coils; 6.5 Gauge Springs Individual Pocket Springs reduce motion transfer Designed for Platform Beds Adjustable Beds and Trundles Compressed and shipped in a box for easy delivery and setup Please allow 48-72 hours for mattress to fully expand