If you like to stay on the cutting-edge of fin design, the Quattro Excel is your fin. It uses Mares' Channel Thrust Technology, which combines flexible thermoplastic rubber channels with Technopolymer stiffening stringers to control water flow for efficiency and power, and the flexible Optimized Pivoting Blade design, which maximizes both stability and efficiency in all kicking styles. The design provides a stiffer, more "traditional" feel than most other modern fins, and it delivers a good bit of thrust, making it an attractive choice for divers who do not want to compromise power in any conditions. Bonus: The fins come with Mares' new ABS-Plus buckles. $180. www.mares.com.