Earlybird Coppercool Performance 10" Medium Hybrid Twin Extra Long Mattress pairs cooling technology with responsive hybrid support to help you sleep comfortably through the night. Memory foam comfort layers, including copper-infused memory foam, sit over a responsive coil core and a durable polyurethane base to deliver medium firmness with pressure relief and targeted support. A breathable cooling cover and Bed In a Box delivery make setup simple, and this Twin XL mattress is made in the USA and backed by a 10 year warranty for lasting confidence.