When you swim with regular foot fins, you can feel the pulsing surge of water past your ears each time you kick down. This tells you that your kick thrust is fluctuating within each kick, giving you lower swimming efficiency. So you can actually feel that foot flippers give this pulsating kick. Their thrust comes in bursts. So, they do not give the more constant thrust of natural swimming without fins that you want. Their pulsating thrust is a real problem. It ruins your natural, streamlined kick.
Now you can have new fins for extra speed and smooth, streamlined kicks for constant thrust within each stroke!
See related faq about improving your kick by aligning these fins to match your kick direction.
See all faqs about why these are the best swim style fins.