Replacement blade for the long Cressi Gara Modular Impulse freediving fins. The Impulse blade has important features: it has a 29-degree angle that allows it to align with the body during the push-off, which increases thrust and reduces ankle fatigue. The Gara Modular Impulse Blade is made from high-modulus polypropylene (2500 Mpa). The blade is made of durable material, very reactive, and highly elastic. It includes two small anti-slip spoilers at the tip. The decreasing thickness (from 4 mm to 2 mm) results in a strongly progressive stiffness that eliminates the tendency to slip, as the first half of the blade is stiffer and the last half is more flexible. The Impulse blade has a 29-degree angle, providing the highest efficiency during the kick cycle, requiring less energy.