From the manufacturer

Gel Memory foam - Our mattress is a gel memory foam boxed mattress designed for various sleepers. It helps you sleep cool and conforms to every curve. Get support where you need it, and comfort where you want it.
Perfect support in any position - whether you're a side sleeper, a back sleeper, a stomach sleeper, or just tossing and turning, our mattresses provide the best hardness, coolness and comfort.
High quality materials: our memory foam mattress, combined with professional knowledge and the best materials, helps to provide advanced sleep technology. Gel memory foam provides continuous airflow to ensure cool sleep at night.
Layered: This 5-inch mattress provides two layers of full foam system 4 "foundation support foam, plus 1" gel memory foam. The foam mattress is a perfect combination of softness and firmness, suitable for all sleeping positions. This medium hardness mattress made of gel memory foam helps support your weight, maintain your body shape, and get the best rest.
General precautions: Please allow 24-72 hours for the mattress to return to its original state. Any memory foam will expand faster in a warm room. In cold temperatures, it may take longer for your mattress to recover from compression to full size upon delivery. The expansion time of a mattress may vary depending on the environment.

Product Description
-- - Best gel memory foam: A-Gel memory foam can automatically adjust according to your body weight and temperature. B - Our gel memory foam is suitable for all frames, such as spring box, floor, Flat noodles base, flat or adjustable bed, hospital bed. C-Memory foam mattresses are compressed and packaged in a box for transportation, so that they can easily be delivered to your door and expanded to its entire noble shape in your home. It is also a good idea to know the size and height of the mattress in advance to ensure that the mattress you ordered is the correct size. Remember, you should combine height of the a bedstead, base, or adjustable bed bottom with the height of the a mattress to measure how high your sleep system is.