Xbounce Anti-Sag Technology- A step ahead in PU Foam Cenflex Foam is a 100% Pure polyurethane [PU] Foam manufactured using German technology, high grade polyurethane raw materials and stringent quality controls. While PU Foam is the gold standard comfort, support and durability across the world, Cenflex's Xbounce Anti-Sag Technology takes it one step further using a proprietary production process to create a stronger, more durable and more resilient product that delivers unmatched comfort.