Lasting Comfort: Double mattress with high quality foam combined with steel inner springs for a spring mattress that is both supportive and moderately soft. Cost-Effective: this Double mattress size: 135 * 190CM, low price and good quality, the surface is made of high-quality 3D knitted fabric, skin-friendly and comfortable, so you can sleep all night. Soft and hard: This 14cm high Double mattress is made of pressure relief foam and steel springs, soft and hard, providing just the right amount of support and comfort. SAFETY AND HEALTHY: The Double mattress is made of high quality foam, which is safe and healthy and meets the standards in terms of durability, performance and content. BEFORE USE: This individually wrapped Double mattress will return to its full shape within 24-72 hours after unpacking, the memory foam layer expands faster in a warm room.