As for the fin type, full foot fins are the preferred choice for spearfishing and freediving. They have a more streamlined design and offer a secure fit, which in turn translates into reduced drag and increased power.
Blade stiffness is another important factor to consider. Stiffer blades allow achieving better propulsion with less effort. Blade’s stiffness mostly depends on the material it is made of. The three most common materials used in manufacturing blades are polymer (plastic), fiberglass and carbon fiber. Carbon fiber blades are the stiffest and the lightest, but also the most expensive type available. One disadvantage of carbon fiber blades is that they are quite delicate. The next option is fiberglass blades. They are more rugged and almost as stiff as the carbon blades. Another advantage of fiberglass blades is their more affordable price, therefore, they are often considered to be a good alternative to carbon blades. Finally, there are polymer blades. These are the most common blades on the market. Polymer blades do not provide the stiffness of carbon fiber or fiberglass blade, but they are very rugged and the least expensive. Polymer blades are commonly available in two stiffnesses and are the best choice for beginner divers.
If you are looking for spearfishing fins, you need to consider one more feature that sets them apart from scuba or even freediving fins - their color. Fins, made specifically for spearfishing often come in a variety of colors and patterns, each of which is designed to camouflage the spearfisherman within his surroundings, making fish less conscious of his presence. The type of camouflage needed will depend on the hunting environment.