The Zinus 12 Inch Gel-Infused Memory Foam Hybrid Mattress provides the best combination of mattress technologies to give you the best night’s sleep. The Swirl Gel Memory Foam layer ensures an ideal sleep temperature, the ViscoLatex layer adds additional foam comfort, while the iCoil Springs provide pressure relieving support and reduce motion transfer for uninterrupted sleep. Comfort Cover is Foam & Fiber Quilted Poly Jacquard. Please open your mattress package within 72 hours of receipt and allow 48 hours for your new mattress to return to its original, plush shape. Another comfort innovation from Zinus. Pioneering comfort.