Check the listing for details. 12" 14"Twin Full Queen King Size Gel Memory Foam Spring Mattress In A Box. Condition: New. Listed at 129.20 USD. STAY COOL ALL NIGHT LONG - Duchessz hybrid mattress covers are made of high-end knit fabric with a comfortable and breathable surface. Cooling Gel-Infused Memory Foam enhances airflow, helps dissipate body heat and stabilizes your sleep temperature, offering a cool sleep experience. BALANCE SUPPORT & PRESSURE RELIEF - Combined the Supportive of pocketed springs with the comfort and adaptability of memory foam to create a comfortable yet supportive mattress. The independent pocketed coils balance your body weight and provide strong support to every part of your body. Memory foam actively contours to your body curve to align the spine and relieve pressure point aches and pains. The mattress has good elasticity and can be used for many years. .