This videos explains the features of the Cressi Master Frog Adjustable Strap Dive Fins. Their Quick release, quick-adjust buckle makes adjusting a snap. The blade is incorporated as a natural extension of the sole, reducing effort and increasing performance.The unique blade material makes it the most powerful and lightest fin in the Cressi line of open-heel fins. These fins will give you a more powerful kick with less effort. They are lightweight and comfortable with 20% more surface area than traditional blade fins.