Experience unparalleled comfort and support with the Revive Cooltek Obsidian Hybrid Firm 13" California King Mattress. Designed in a sophisticated grey hue, this mattress combines the best of both worlds with its hybrid construction, ensuring a restful night's sleep. The firm comfort level is perfect for those who need extra support, while the high-quality fabric made from a blend of cotton and polyester adds a touch of luxury to your bedroom.