Product details:

The Serta 9-inch Gel Memory Foam Mattress offers two layers of comfort gel infused memory foam which contours to your pressure points for a perfect night of sleep Our cooling memory foam will keep you sleeping cool and sound all night long Remove from packaging within 72 hours to maximize expansion. You can sleep on it the same night it is unwrapped, however allow 48 hours to fully return to its original shape. Vacuum sealing sometimes traps odors. After unwrapping, air for a few hours to eliminate trapped odors. Due to machine-cutting manufacturing processes, there may be slight variances in the dimensions of this product. Due to the nature of memory foam, the firmness level of similar products may produce different firmness results.