Fins generally come in “full-foot” and “open-heel” types, and you should have open heels for your first set. Just like shoes may look like a good fit until you put them on, full-foot fins need to be sized carefully and take some getting used to. Open-heel fins are easier to adjust and will let you try out accessories like dive booties to limit blisters and discomfort. They’re also easier to share between groups, so you won’t need to buy multiple sets if you’re not all going in the water at once. Don’t wait for a beach trip to use them, these fins are great for other outdoor activities such as canoeing and rafting.