I just purchased the FCS Competition Essential Leash and FCS II Hayden Shapes Tri Fins. Tried the leash out of the box and super happy with the secure fit around my ankle. For sure an upgrade to the last time I bought a leash 3 years ago. The FCS II Hayden Fins are sick with my groveler, I feel like the inside foil works best with grovelers in generating a bit more speed and flow in softer waves. I wish FCS had more foiled shapes with their fins.