Engineered for balanced performance: The Glass Flex material and well-rounded template are designed to deliver a harmonious blend of speed, drive and maneuverability Moulded composite flex construction: Built from engineering-grade polymer, these fins feature an engineered flex and tip-response that help intermediate and advancing surfers maintain momentum while carving and transitioning turns. Ideal conditions & rider levels: Perfect for beach breaks to point breaks, and recommended for riders of all levels, especially those wanting a reliable all-round thruster fin set. Backed by trusted fin heritage: Designed by FCS world-renowned for high-performance surf accessories and tested for durability, hold and responsiveness in real-world surf sessions. Upgrade your surfing setup with the FCS Glass Flex Tri Fin Set the perfect all-round thruster for surfers who demand versatility, reliability and performance. Crafted from advanced composite material, the Glass Flex construction delivers a responsive flex pattern and efficient tip exit, helping you unlock speed while remaining agile through turns and manoeuvres. Whether you’re hitting beach breaks or clean point-break waves, these fins are built to adapt. Their well-rounded shape strikes the ideal balance between drive and control, delivering confident performance session after session. They’re built to fit all board types and integrate seamlessly with the FCS II system (with grub screws and the Infill Kit), making them easy to install on your board. Available in sizes small to Large, you can match the fin size to your rider weight for the perfect fit and response. Whether you’re learning the ropes or refining your technique, the Glass Flex Tri Fin Set is engineered to help you raise your game without sacrificing stability or feel. Trust in FCS’s legacy of surf innovation and get ready to ride with greater precision, speed and fun.