12-inch double mattress, box-packed mixed double mattress, 3 layers of high-quality foam, with bagged springs

【We Keep it Cool】This mattress twin is designed with 3D soft knit fabric on the top cover which is breathable and skin-friendly, absorbing moisture and balancing body temperature. High density memory foam under the cover promotes air flow when sleeping on this twin mattress. mattress provides a cosy environment for better sleep(it feels like magic). 【Twin Size Mattress in A Box】Your mattress is compressed, rolled, and shipped in a box for a simple setup; easily fitting through narrow hallways and staircases. Please kindly wait for 48-72 hours to fully expand, for any potential odors to dissipate. The expansion process may be faster in a warm room and slower in a cold environment. 【Motion Isolation for a Peaceful Undisturbed Sleep】The individual innerspring pocket coils in this twin bed mattress work independently, you don't have to worry about waking up your sleeping partner every time you climb into or out of bed or change position. Pocket coils are separated by the isolated fabrics and there is little feel of coils underneath.