Flexible Surf Fins These fins are designed with a level of flexibility to improve maneuverability in the water. The flexible construction delivers a smooth, responsive ride and enhances your surfing experience. Standard Longboard Fin Box Compatibility Compatible with standard longboard fin boxes for broad board compatibility. Suitable for a wide range of SUPs and longboards. Easy to attach and detach, offering convenience and versatility for your water adventures. Material Made of PVC material for longlasting performance. Sturdy construction withstands the rigors of river running. Provides stability and control while surfing. Color Options Available in black, yellow, and green. Adds a splash of color to your board; choose the color that matches your style. Use Scenarios River running and moving water: improved maneuverability and stable control in demanding conditions. Surfing on waves with different boards: quick fin swaps thanks to standard fin box compatibility. SUP cruising or longboard riding: versatile fin performance with easy attachment and detachment for various riding styles.