High Resilience (HR) foam
HR foams are flexible polyurethane foams with high performance properties for superior comfort, support and durability. HR foams can be used in both cushioning and bedding applications. HR foam has a better support factor and higher fatigue resistance compared to conventional foam. The bottom of your cushion does not permanently deform with extended use. Ultracell and Velva Foam are both registered trade marks and HR foams.