Demarini CF5-8 Baseball Bat In Chaos, DeMarini Found Strength: TR3 F.L.O. TR3 F.L.O (Fused Layer Optimized) Composite is a cutting edge formation of DeMarini's TR3 composite. Sweet. Exponentially Speaking: Double Wall Construction. At the core of DeMarini's Double Wall Construction is two independent composite walls with thin layers and tight weave separated by DeMarini Flex Film. The CF5's internal Geo End Cap is designed to maintain stiffness in the barrel. Keeping the energy focused at the impact of the ball prevents power from escaping out the end of the bat, resulting in a better explosion off the barrel. The CF5 is lighter and stronger through technology and design. It is the most balanced Bat on the market and it is all about bat speed.