Sarah Peyton 10 inch Soft Luxury King Memory Foam Mattress Supportive 4.0-lb. density memory foam eliminates back and joint pain associated with most common innerspring mattresses Memory Foam is resistant to dust mites and is naturally antimicrobial Vacuum packed to 1/3 the size of the mattress - returns to 100 percent in 24 hours Due to the nature of Memory Foam, the firmness level of every item is unique. Please be advised that even similar products may produce different firmness results This product arrives very tightly packed. Please unwrap and allow 48 hours for this product to return to its original shape