Even though fins aren't a must-have for diving, wearing fins have proven to boost your confidence levels as a diver and to help you swim larger distances faster with less effort. Like normal shoes, fins coming in different styles and sizes you can choose from but, the most commonly used types being the open foot fins and the closed foot fins. The open foot fin is similar to sandals or a pair of heels; it covers the front of your foot and is locked on to your foot by a strap at the back. The closed foot fin, on the other hand, works like a pair of sneakers or running shoes; it covers your entire foot. In addition to helping you swim faster. Fins also protect your feet from any underwater accidents like hitting rocks or accidentally hitting corals.