Premium material: This SUP fin is made of nylon plastic with a smooth surface treatment, offering durability and robust performance. It provides excellent wear resistance and impact resistance, ensuring stable attachment to the surfboard. Exterior Design: The inflatable surfboard fin features a snap-in safety reinforcement buckle and a unique shape. The top end is fin-shaped with a streamlined appearance designed in accordance with hydrodynamic principles for water sports. This enhances the surfboard's maneuverability and supports safe paddling. Convenient Use: Attach the fin base to the back of the surfboard first, then secure the fin to the base using the snap-in safety reinforcement buckle (fin base not included). When not in use, simply slide the buckle to remove the fin. Compatible with most surfboards, including paddleboards, inflatable SUP boards, stand-up paddle boards, and canoes. Best choice: This kayak tracking fin improves surfboard stability and balance, reduces drifting caused by water currents during paddling, and is especially suitable for beginner riders seeking enhanced control.