The Sapphire | Medium Mattress combines value and comfort, making it a smart choice for back and side sleepers. With a 4–5 firmness rating, it offers a balanced medium feel that relieves pressure while supporting proper alignment. A cooling silk-quilted cover and soft comfort foams provide plush cushioning, while a gel-infused lumbar layer enhances support where you need it most. The 768-count pocketed coil system minimizes motion transfer and delivers consistent stability, reinforced by 360° edge support for a larger usable sleep surface. Backed by a 10-year warranty, 100-night trial, and Mattress King’s fast 1-day delivery, Sapphire brings reliable comfort at an affordable price.