This gel memory foam mattress combines supportive steel springs and plush memory foam for comfort and support you can always rely on. The Linenspa Essentials 10-inch California King Memory Foam Hybrid Mattress utilizes conforming memory foam that cradles your body while you sleep, while the traditional innerspring layer creates lasting support. The medium feel of this California King hybrid mattress makes it perfect for all sleep styles and preferences. Plus, this convenient hybrid mattress-in-a-box ships right to your door. Just unbox it, let it decompress for up to 48 hours, and enjoy all the cool and comfortable nights ahead. Color: Gray. Material: Polyester.