Hybrid tech, sleep-friendly tech at a great price. Engineered for comfort, Patented titanium alloy Aerocoil springs supports spinal alignment & pressure relief.CertiPUR® foam base features seven support zones to mirror your body shape. Countour: each spring compresses in response to body weight, aiding pressure relief and improved support. Cool: they encourage the flow of fresh air through the mattress as they compress. Control: their conical shape means they compress inwards, limiting the transfer of movement.