Fins are available in two basic styles: heel strap and full foot. Full foot fins have a soft pocket that fits your bare foot, while heel strap fins are open at the rear and have an adjustable heel strap.

Most heel strap fins are designed to be worn with booties, so they are the required style if you plan on diving in cold water. And since wearing booties is even beneficial in warm water, heel strap fins can be used in tropical waters as well. For this reason, heel strap fins provide the most versatility, and are the best choice for divers.