Dyonery 3-Inch Ultra-Firm Mattress Topper - Gel-Infused Bamboo Charcoal Cooling Pad for Back Pain Relief - High-Density Mattress Overlay，King.

Relieve pain and protect the spine - The double-layer decompression hard memory sponge mattress cushion fits your curves, evenly distributes weight, corrects the spine, and relieves pressure points. Comprehensive stress relief - The mattress cushion layer is made of 38D supportive high-density memory foam, which can easily fit your body curves and reduce pain during sleep no matter what sleeping position you adopt. Double layer design, soft and hard optional - the double-layer foam design is adopted, the upper layer of the mattress cushion is hard, and the lower layer is hard, providing you with "just right" soft and hard. 38D high-density memory cotton - The memory cotton mattress is made of 38D high-density memory cotton, which has more resilience than other traditional memory cotton and is suitable for people of different weights. It is durable and not easy to sink or tear. A healthier sleeping environment - Memory sponge mattress, whose composition, emissions, and durability exceed standards and have been analyzed by an independently accredited testing laboratory