Fins for Frog Kicking: What Actually Matters

For frog kicking, choose a stiff, non-split blade with spring straps and a foot pocket that fits your boots. Match the fin's buoyancy to your exposure suit: heavier fins help keep a drysuit diver's feet down, lighter ones suit a thin wetsuit. UTD's propulsion training requires non-split fins, and split fins struggle with frog and back kicks.

By Jeremiah Gardner · Last reviewed October 16, 2026

Fin advice usually comes down to brands. The truth is simpler: a few characteristics matter for frog kicking, back kicking and turning in place, and many fins have them.

What makes a fin good for frog kicking?

Criterion	Why it matters
Non-split blade	Gives you a solid surface to push water on the power stroke and to pull against in a back kick
Stiff or rigid blade	Holds its shape through the sweep instead of bending away the force
Moderate length	Long, soft blades suit flutter kicking; frog kicking favors shorter, stiffer blades
Spring straps	Constant tension, easy to grab with gloves, no buckles to slip or snap
Pocket that fits your boots	A loose pocket wastes energy and blisters; a tight one cramps
Buoyancy that suits your suit	Fin weight changes your trim, especially in a drysuit

UTD's propulsion training requires non-split fins, and Gardner Underwater's equipment list calls for blade or jet-style fins.

Why do split fins struggle?

Split fins are designed for flutter kicking: the split lets the blade flex and channel water with fast, small strokes. That design works against the techniques DIR divers rely on:

Frog kick: the sweep needs a firm blade to push water behind you. A split blade lets it slip through.
Back kick: you pull water toward you with the blade flat. A split fin folds instead of catching water.
Helicopter turn: the small, precise movements need a blade that responds immediately.

You can frog kick in split fins, but every stroke moves you less, and the back kick is very hard to learn in them.

How does fin weight affect trim?

Fins sit at the end of a long lever, your legs, so their weight changes your trim more than you'd expect.

In a drysuit, gas can collect in raised feet. Assess suit gas, fit and posture first; changing fins must not hide a suit-control problem.
In a thin wetsuit, very heavy fins can pull your feet down, especially with an aluminum cylinder that becomes buoyant at the end of the dive.

The answer isn't the same for everyone. Hover still, in your actual suit, with each pair of fins and see what your feet do. See Horizontal Trim.

Vented or solid blade?

Both work. Vented, jet-style blades are a classic choice among DIR and technical divers: stiff, durable and negative. Solid blades are often a little lighter. Choose on stiffness, fit and buoyancy, not on vents.

What about boots and fit?

Try fins with the boots you'll actually dive in. A thick drysuit boot and a thin wetsuit bootie need different pocket sizes, and you may need different fins for each. The fin should feel like part of your foot, with no movement in the pocket when you rotate your ankle.

Fins won't fix technique

Good fins make good technique easier. They don't create it. If your knees drop or you kick from the hips, new fins won't help much. See How to Frog Kick and Scuba Finning Techniques.

Get your kick checked

Our Propulsion and Back Kick Extension focuses on non-silting propulsion and positioning kicks, with feedback on your technique and your fins. You can rent gear and get equipment serviced through our shop.

Frequently asked questions

Why don't split fins work well for frog kicking?

Split fins are designed to flex and channel water during a flutter kick. In a frog kick or back kick, they don't give you a firm surface to push water with, so each stroke moves you less. UTD's propulsion training requires non-split fins.

Are jet-style fins good for frog kicking?

Yes. Stiff, vented, jet-style blades are a long-standing choice among DIR and technical divers. Gardner Underwater's equipment list accepts blade or jet-style fins.

Do spring straps matter?

They help. Spring straps hold tension without adjusting, are easy to grab in gloves and still need inspection for corrosion, attachment security and fit.

Should my fins float or sink?

It depends on your suit. Fin buoyancy affects trim, but there is no universal drysuit-versus-wetsuit answer. Test fit and trim with the actual suit, cylinder and ballast. Heavy fins are not a substitute for managing suit gas and correcting posture.