Swim Fin Sizing Made Easy!

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Swim Fin Sizing Made Easy!

Swim Fin Sizing Made Easy!

Swimming with fins is an important way to develop your kick and build leg strength.

Read this guide and learn how to get the perfect fit, every time.

Proper Swim Fin Sizing Is Easy

Can selecting your swimming fin size be as straightforward as checking your shoe size?

Not always, but fitting fins shouldn’t be challenging or frustrating.

5 Key Tips For Fitting Fins

Sole To Sole Swim Fin Comparison
Match sole to sole to assess fit.

1. Shoe Size

Start by choosing fin size based on your shoe size. If you wear a size 10 in your daily shoes, begin with a size 10 swimming fin.

Upon receiving your fins, or during your visit to a Kiefer Swim Shop, make a visual comparison by aligning the sole of your shoe with the sole of your fin.

2. Trying On Your Swimming Fins – Dry / Wet

 

Toe Position

It’s OK for toes to show in the fin’s foot pocket window, but make sure that your toes do not protrude from the foot pocket window.

Dry Fitting – Be Careful!

If you are fitting fins dry, inserting your feet into the swim fin foot pocket is met with ample resistance. Some new fins are “greased” or “powdered” and may not present this issue, but most swimming fins are not.

Swim Fin Fitting
Don’t allow a loose fit! Fins should be snug.

Struggling to enter dry fins may cause you to “size up” unnecessarily, resulting in floppy fins that are inappropriately loose in water.

Wet Fitting – Ideal!

The ultimate approach to fitting swim fins is fitting them in the water and taking them for a spin in the pool.

3. Close, Snug Fitting Swim Fins Preferred!

Fins should fit snugly; if you can fit multiple fingers in the space between fin and skin they are too big. Fins should not be loose. A loose fin will cause chaffing and likely painful blisters in the long run.

4. Between Fin Sizes? Put A Sock In It!

Kiefer Lycra Watersox
Add Kiefer Lycra Watersox to fill unnecessary gaps.

If you find that your feet fall between fin sizes, don’t give up! Grab Kiefer Lycra Socks to fill the gaps. They will add padding and comfort and eliminate uncomfortable rubbing.

5. Not Satisfied With The Fit Of Your Fins? Don’t Worry!

We want swimmers to be happy with the fit of their Kiefer Swim Fins.

Save your receipt! If you are unhappy with the fit of your fins, follow Kiefer’s Returns procedure to exchange/refund fins fit in the water that do not meet your fit expectations.

Kiefer Can Fit You!

There is a good fit for everyone out there. Don’t let one bad fit get you down – try our selection of swim fins to discover what works the best for you and your swim training.

Looking for help choosing a swim fin style? Check out our blog post on how to choose swim fins.

About Emily Milak

Emily Milak is a lifetime competitive swimmer living in Southeastern Wisconsin. Emily is a US National Team champion, NCAA champion, and USMS champion with extensive coaching experience. She is a product development consultant at Kiefer.

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I've been a swimmer my whole life. My parents started me with lessons as a three year old and by five I had joined my first team. I started swimming year round at eight and by thirteen I was qualified for Junior Nationals. By fifteen I was a member of the US National Junior Team (National 'B' Team) and a Senior National Qualifier. I attened my first Olympic Trials in 2000 and finished third in the 200 butterfly. I am a US National Champion, three time NCAA Champion, NCAA record holder, and was a memeber of the US National 'A' Team for five years. I've competed in two World Championships, two Duel in the Pools, a Pan Pacific Championship where I earned a bronze medal in the 200 fly, and competitor in the Goodwill Games. I love to swim and love to coach. I have been working with 12 & Unders for the past ten years including a lengthy stint as the head age group coach in Houston, TX with the toughest bunch of little swimmers I have ever had the privilege of working with. Now I am a mom who swims! I substitute coach and swim master's. I have only competed at one Master's Nationals but walked away a two time champion.

6 Comments
  • Jane says:

    My son wears a size 10 toddler. (He’s 4yo.) What size would fit him in your flippers?

    • Emily Milak says:

      Hi Jane, looks like the closest we’ve got is youth 11-1 which is the green thrust fin. Little ones are a bit more challenging to fit, there isn’t much out there for them at this age. I’m finding the same problem looking for a pair for my four year old as well.

      In the past I have found adjustable snap fins from Finis, however that was some five or six years ago now.

  • Richard says:

    Is there a swim fin that is a 15 or 16 in comparison to a mans shoes size ?

    • Emily Milak says:

      Hi Richard, it looks like our fins as well as a few of our competitors fin sizes kind of stall out at the 13-15 range. Our Kiefer rubber fins do have some flex to them for sure, but without fitting you in person I couldn’t say with certainty that they would be comfortable. One thing that might help with tight fins are a pair of socks, which of course would make them more snug, but it would help alleviate friction between the fin and your skin.

  • Pat McCarthy. says:

    I have size 9 shoes. Why isn’t their a small-xl chart that shows what size fins = size 9 feet?

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