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PDF Fins -- also known as Positive Drive Fins -- are a short-blade training fin that can be used by swimmers of all levels to boost cardiovascular conditioning and to increase speed during workouts.

PDF Fins have a unique, oval-shaped blade and an offset, asymmetrical foot pocket.  The fins are angled slightly inward, which encourages the swimmer’s feet to supinate or “turn in” slightly during the kick cycle.  

This turned-in position allows the fin to provide Positive Drive, no matter what kick you’re doing, and regardless of whether you’re kicking up or down.  

When you swim freestyle, PDF Fins encourage you to have a small, quick kick that drives you forward on the upkick and on the downkick.

The same thing applies when you swim backstroke.  The PDFs help you build a powerful kick in both directions -- Up and Down. 

PDF Fins are an exceptional tool for butterfly, where good technique calls for the feet to be turned in slightly, and for the swimmer to apply power on both the downkick and the upkick.   

An added bonus is that the short blade gives you a little extra umph during butterfly training, but not so much extra help that you feel lost when you take them off.

PDF Fins are also known as “the breaststroke fin,” because they provide Positive Drive, even when the feet are turned out for the breaststroke kick.

This unique feature -- the fact that you can swim all four strokes with the PDFs -- makes them an incredibly versatile and fun training tool, especially for Individual Medley (IM) training.

PDF Fins come in various sizes.  They have an adjustable strap and an open heel, which puts your foot in a more “natural” position during kicking.  And they have a very ergonomic foot pocket, which makes them comfortable for longer sets.  

PDFs will benefit every level of swimmer from beginner to advanced -- helping improve speed and technique in all four strokes.

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PDF Fins