This is the Cressi Sub Gara 2000 HF Free Diving Fins Features: More rigid and less flexible than the Gara 3000 Used by many world-class free diving competitors Designed for free diving and spearfishing A better snap for better performance Long blades maximize thrust, minimizing work Blade Length: 33 The first fin in the world made by combining three different materials, a process that Cressi perfected and patented with this fin, which guarantees unsurpassable performance. "