Breathable Cover & 5 Zones Design: 3D skin friendly soft knit fabric on the top cover which is breathable and 5 Zones support .absorbring moisture . balancing body temperature and pressure relief. Advanced Coil System : Because of the most advanced individually wrapped coil systems at its core . it not only provides excellent edge support . but it also gives the mattress the flexibility to conform to an adjustable base with ease. Each coil is pocketed and individually wrapped to prevent tangling. This design allows for Zero Motion Transfer . meaning . when your partner moves around . you won't feel a thing. Durability & Supportive: All foam layers are made with high density foam for comfort and durability. With a whole foot of high density foam . we can ensure long-lasting comfort and no sagging. Multiple support layers for increasing firmness to provide subtle support where needed. Medium Firmness : AFAN twin size Mattress is a medium yet contouring hybrid mattress . which makes it the perfect choice for all types of sleepers; from children to teens to adults. Safe . healthy . and affordable. Mattress in A Box: AFAN mattress is compressed . rolled for a simple setup; easily fitting through narrow hallways and staircases. It fits all frames . such as box spring . floor . slatted base . flat platform or adjustable bed. Warm Tips: Your mattress will regain its full shape within 24-72 hours of opening. The expansion process may be faster in a warm room and slower in a cold environment.