Knit 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 MATTRESS IN A BOX—All the comfort and trusted quality of a Sealy mattress.LAYERS OF COMFORT—Softer conforming memory foam “hugs” you for personalized comfort throughout the night, denser foam layers deeper in the mattress keep you supported IDEAL FOR ALL SLEEP POSITIONS—This medium mattress is designed for the way you sleep, whether that’s on your back, stomach, or side CONVENIENT and DURABLE—Shipped direct to you and built to last, you can rest easy on this premium 8 inch mattress for years to come