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Boost speed & intensity: designed to help you push harder during swim workouts Comfortable fit: soft silicone foot pocket for a secure, comfortable feel Stronger flutter kick: short stiff blade supports a more powerful and accurate kick The Arena Powerfin is a classic training fin built for swimmers who want to improve propulsion, cadence, and cardiovascular conditioning. With its soft silicone foot pocket and short stiff blade, it encourages a stronger, more accurate flutter kickideal for drills, technique work, and high-intensity training sessions.