Andrew talks about why we use long fins for spearfishing and freediving, and compares them to shorter fins typically used for snorkeling or scuba diving. 

Shorter fins tend to be better suited for snorkeling or scuba diving, or for beginner freedivers who are learning the basics of finning. Longer fins are more suitable for freediving and spearfishing, when you require that extra length to move more water with each kick to get down to deeper depths. Andrew recommends picking up a pair of fins that has a detachable foot pocket, which allows you to upgrade your fins in the future to carbon fiber or fiberglass, without having to buy another set of foot pockets. In terms of stiffness, beginners, pure freedivers, and people under 165lbs will want fins with a softer blade. For people who weigh 165lbs and more, or are focusing more on spearfishing and have experience using long fins, Andrew recommends a more medium stiff blade. Hard stiffness blades are reserved for individuals weighing more than 200lbs, or with very strong legs or have the need for stronger fins to fight currents. 

Plastic fins tend to be very durable and on the cheaper end, and are great for beginners or people on a budget. However plastic fins are also heavier when compared to fins made from fiberglass or carbon fiber. The latter materials while being more expensive, tend to be significantly lighter and more responsive and efficient when compared to plastic fins. However as there are alot of variables and differences between plastic fins, the same can be said for carbon fiber and fiberglass. Andrew will cover these topics in another video.