The King Koil Spine Support Charleston mattress collection delivers plush, euro pillow top sleeping comfort and back support at an exceptional value. Designed to support natural body alignment, the Charleston mattresses feature foam comfort layers and foam-encased LFK coils systems for superior comfort and edge support. The Charleston Euro Top Mattress from Spine Support Collection by King Koil delivers plush, euro pillow top sleeping comfort and back support at an exceptional value. Designed to support natural body alignment, the Charleston mattresses feature foam comfort layers and foam-encased LFK coils systems for superior comfort and edge support.