Your choice of available size options. Firm memory foam mattress. 6 in. thick. Eucalyptus-based top foam layer wicks away moisture. Cover unzips and is machine washable. Features high-density support core. 1-year manufacturer's warranty. The Sierra Sleep by Ashley 6 in. Memory Foam Kids Mattress is all about dynamic support for today's active kids. With the pressures of school and social life, kids deserve a firm, pressure-relieving sleep surface. A top layer of ventilated, eucalyptus-based foam allows body heat to dissipate, creating a an ideal thermal environment for comfortable sleep. Box spring is not included.Dimensions:Twin: 74L x 38W x 6H in.Full: 74L x 53W x 6H in.