Dive fins are a great aid to have for underwater adventures. They help progress movement while in the water for faster propulsion. There are two main types of heeled fins: open-heel and closed-heel. Open-heel fins have large pockets for your foot and are secured by an adjustable strap in the back of the heel. They're designed to be worn with dive booties and are great for colder waters. Most divers favor open-heeled fins for their ability to keep feet warm. In contrast, closed-heel fins do not allow the use of dive booties and are typically used in warmer waters. Your foot also fits completely inside a closed-heel fin, much like a shoe. Furthermore, there are no adjustable straps with a closed-heel.
Your chosen activity will dictate what type of fin to wear. If you plan on snorkeling in a tropical region, closed-heel fins are ideal. Warm, tropical regions generally do not require the use of dive booties. On the other hand, open-heel fins are better for divers or snorkelers in colder waters. It's critical that divers wear dive booties while scuba diving so they can keep warm, comfortable, and safe in frigid water.
In addition to the heel type, you can choose from a multitude of different fin features. Some of these include a split fin which has a split down the middle and promotes better propulsion. On split fins, less strength is needed to kick since water can easily move between the slit. Paddle fins are also popular. They feature a very basic design and essentially act as extensions of the feet. Regardless of the type of fin you choose, it's important to choose the right heel type suitable for your excursions so you can have a comfortable experience on your next dive.