Five Mattress Layers - Five quality layers 10 inches thick, give you just the right combination of comfort and support. So you sleep like an exhausted bear in winter..General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.The expansion time of the mattress will vary as per the surrounding Memory Foam - This comfy layer of pressure relieving memory foam adapts to your unique body shape and size - cushioning your body, so every joint and muscle can truly relax. Tend to sleep a little warmer? The Siena’s gel memory foam layer helps wick away excess body heat. And air pockets between the layers allow the mattress to breathe. So you can sleep comfortably, even when it’s hot out. 180-Night Home Trial - We chose every material with your sleep comfort in mind. So you get a naturally comfortable sleep. All at an affordable price. Plus, get a 180-night home trial, to make sure it’s perfect for you.