Earlybird Coppercool Performance 12" Medium Hybrid Twin Extra Long Mattress delivers balanced, medium support with cooling performance for extended, everyday comfort. A responsive hybrid core pairs supportive coils with layers of memory foam and polyurethane for pressure relief and lasting support. The cooling cover and Coppercool surface help manage temperature, and the mattress ships compressed in a bed in a box for easy setup, backed by a 10 year warranty and compatible with standard foundations and box springs.