For diving fins are an integral part of how we move around underwater they are one of the most efficient ways to propel ourselves with all of our gear on. While there is no perfect science for finding fins this will cover some considerations in determining which fins will best suit your diving style. This will be more handy for divers looking for their first set of fins but could also be helpful for divers looking to replace an old pair of fins.
First consideration: full foot or open heel?
Full foot fins are generally regarded as snorkeling fins but are often used as diving fins for warm water. They are usually a bit smaller than traditional fins, use a full foot pocket with heel, and usually are a bit lighter and cheaper than open heel fins. These are a good option for someone who only plans on doing warm water diving, they will not keep your feet warm enough for cold water diving. The sizing for these fins usually is a range of shoe sizes (7-8, 9-10, 11-12 etc…) this will vary with each brand.
Open heel fins are just what they sound like they have a foot pocket with no heel and a strap to keep the foot secure. These fins are almost always used with booties. They are generally a little bit more robust in the blade and the foot pocket to accommodate the boot, and can cost a little more. The open heel fin is the ideal fin for diving because of its versatility, despite the extra weight can be used in warm or cold water by going to a thinner or thicker boot, feet are also something that we need to worry about overheating while diving so wearing a thick boot in warm water isn’t an issue, except for travel weight. Open heel fins can also have a variety of different straps for the heel ranging from rubber or silicone adjustable with clips for quick disconnect, to silicone, bungee, or spring straps that are usually at a set tension and used for easy removal. This can effect the cost of the fin but can also usually be changed so if you would like to upgrade to spring style straps that is possible. The sizes of the open heel fins is much more general usually ranging from XS to XL but with the adjustable strap or spring strap able to accommodate a wider variety of foot sizes.
Second Consideration: Comfort.
This is the most import step in finding the right fin, comfort should be your primary objective because if its not it will make the experience unbearable like going on a hike in dress shoes. Depending on which style of fin you decide to go with you will be next trying them on, if you are getting an open heel you will need to find a comfortable bootie first. For the full foot fins you want to make sure that when in the pocket your foot is secure and not shifting around, too much space could lead to rub spots that cause blisters. You also don’t want the foot pocket too tight because it may cause cramping in the foot. Consider trying out different brands if possible because their foot pockets and ranges of sizes will differ. For open heel fins it will be a very similar process you want to try on different sizes and make sure that the bootie fills the entire pocket you should not have any gaps when worn, gaps can cause the fin to move and shift on the foot and work less efficiently. For people with small feet make sure that the heel strap is not completely maxed out, sometimes this can still not be enough and the fin can fall off under heavy kicking. Check and make sure that the foot is not experiencing and squeezes or pressure points from the pockets these can become uncomfortable and possibly cause cramping, sometimes due to the heel strap being to tight. For both the full foot and the open heel make sure to extend the leg and kick with the toes pointed to replicate the position your foot will been in while diving this will be a more accurate portrayal of how the fin will feel. Consult with the sales person if you are having trouble determining if it is a good fit, but ultimately you will feel if it is comfortable or not.
Third Consideration: soft or stiff blade?
The softness or stiffness of the fin blade will differ from style to style and most brands will have a range to accommodate all styles of divers. Soft blades have a lot of flex to them and are much easier to kick but do not provide a great deal of power. With the soft blade it will not be as obvious that you are kicking a fin and will feel like a more fluid motion. Softer blades are most efficient with the flutter style kick. These are generally popular with newer divers, divers with injuries, or divers that may not have the best kicking form because they are more forgiving and require less strain. Stiff blades will provide more resistance when kicking and have increased power to the kicks, you will be aware that you are kicking. These fins can be a little heavier and sometimes shorter, becoming very popular in the technical diving space because of the ability to maneuver and push a diver with more equipment. These blades work best with some form of frog kick, but can be efficient when the flutter kick is used as well. This fin is best for divers that are used to kicking and have stronger legs and a good kicking form to maximize their efficiency. There are also a variety of fins in-between soft and stiff, like stated before focus on comfort first if you are a new diver whatever you start with will become your normal.
For divers replacing an old pair of fins, I generally suggest sticking with a fin that is roughly the same stiffness or softness as the last pair. If you have been diving that fin for a while it will be an awkward transition going from soft to stiff and vise versa. If you have not been diving in a while and don’t remember how soft or stiff your fins may have been it shouldn’t matter that much.
Split fins: these are fins that are just what they sound like split down the middle of the fin leaving two fins instead of a single blade per foot. The split fin is very efficient in how they work channeling the water straight back on both the up and down kick. A majority of the time the split fin is a very soft fin, ideal for divers that may have a injury that could affect their kick. While very popular for a while new fin designs have found ways to maximize efficiency of the fin with out the split, so they are becoming less common.
Fourth Consideration: Color.
Like all other dive equipment most fins will come in a variety of colors to allow divers to personalize their gear. The color of the fin will not affect its performance, so in reality it doesn’t matter but some divers will choose a particular set of fins over another because of the color option. I recommend agains this but if you need to match your gear have at it. Most fins will offer at least the basic 3 colors (black, blue, yellow) but with new styles more colors are becoming popular (teal, pink, purple etc…) Fins are a great way to identify other divers underwater and having a different color will make you more recognizable. Some more tech oriented fins will often only be offered in one color usually black, but many divers will write their names on them to make them identifiable.