Equipment manufacturer of bifins and monofins for swimming with fins and freediving
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Finswimming FAQ

Everything you need to know about swimming fins

There are two main types of swimming fins: bifins and monofins.

  • Bifins are the most common. They have two large fins that propel the water.
  • Monofins have a single large fin that is attached to the foot. They are more powerful than bifins, but they are also more difficult to use.

Swimming fins offer many benefits, including:

  • Increase speed and distance
  • Improve strength and endurance
  • Learn new swimming techniques

The size of swimming fins is important to ensure optimal comfort and performance. It is recommended to measure your foot length and choose a size that matches your shoe size.

The hardness of the swimming fins determines the propulsion power.

  • Harder finsare more powerful, but they can also be more difficult to use.
  • Softer fins are easier to use, but they are less powerful.

It is important to warm up before using swimming fins. It is also important to wear swimming goggles to protect your eyes.

It is important to clean your swimming fins after each use. You can wash them with clean water and soap. You can also air dry them.

Choosing the right swimming fins depends on your swimming level, your goals, and your budget.

Here are some questions to ask yourself to help you make your choice:

  • What is my swimming level?
  • What are my goals?
  • What is my height and shoe size?
  • What is my budget?

If you are new to swimming, it is recommended to choose soft swimming fins. These fins are easier to use and will allow you to learn the basics of swimming.

If you are an experienced swimmer, you can choose harder swimming fins. These fins will allow you to increase your speed and strength.

If you are on a budget, you can choose basic quality swimming fins. These fins will be sufficient for beginners or occasional swimmers.

If you have a higher budget, you can choose premium quality fiber or carbon swimming fins. These fins will be more comfortable and more durable.

The choice of materials and type of fins depends on the activity practiced.

  • For recreational fin swimming, polymer fins are a good choice. They are light and comfortable, and they provide enough propulsion to swim faster and easier.
  • For competitive fin swimming, fiberglass or carbon fins are a better choice. They offer better propulsion and allow higher speeds to be reached.
  • For freediving, fiberglass or carbon fins are also a good choice. They provide good propulsion and allow you to swim longer without breathing.
  • For spearfishing, fiberglass or carbon fins are essential. They offer good propulsion and allow you to move quickly and easily underwater.

Here are some specific recommendations for each activity:

  • Recreational swimming with fins: polymer fins, medium size, medium hardness.
  • Competitive fin swimming: fiberglass or carbon fins, custom size, high hardness.
  • Apnea: fiberglass or carbon fins, medium size, medium hardness.
  • Underwater fishing: fiberglass or carbon fins, custom size, high hardness.

Of course, these recommendations are only general. The best way to choose the right fins for you is to try them out and see what works best for you.

POwerfins swimming bifins and monofins

Polymer swimming fins are a great choice for swimmers of all levels. They offer good propulsion, reasonable durability, and comfort, while being relatively affordable.

POWerfins Polymer Bifins

Polymer bifins are the most common. They provide powerful and efficient propulsion, making swimming faster and easier. They are also more stable than monofins, making them easier to use.

POWerfins Polymer Monofins

Polymer monofins are more specialized and are generally used by experienced swimmers. They offer even more powerful propulsion than bifins, allowing greater speeds and distances to be achieved. They are also more maneuverable than bifins, which allows for more precise movements.

Powerfins polymer bifins are CMAS approved for competitions. This means that they meet the performance and safety standards defined by the World Confederation of Underwater Activities (CMAS).

CMAS approved bifins must meet the following criteria:

  • Sail length: 25 to 45 cm
  • Width of the sail: 10 to 20 cm
  • Distance between clips: 10 to 20 cm
  • Material: composite material or rubber
  • Hardness: soft, medium, or hard

Powerfins polymer bifins meet all these criteria. They are therefore authorized for fin swimming competitions organized by CMAS.

The collaboration between Powerfins and Pathos focuses on combining Powerfins’ expertise as a swimming fin manufacturer, specializing in the design and manufacturing of fiberglass or carbon blades. , with the know-how of Pathos as a globally recognized manufacturer of swimming slippers. Powerfins sails are carefully designed to ensure optimal propulsion and performance. Made from fiberglass or carbon, they are specially designed to meet the high demands of swimmers. On the other hand, Pathos slippers enjoy a worldwide reputation due to their exceptional comfort, durability and remarkable performance. Made from high quality materials, these slippers are carefully designed to provide a perfect fit to the swimmer’s foot. The merger of these two expertises allows Powerfins to create innovative bifins. By combining Powerfins’ fiberglass or carbon blades with Pathos liners, the resulting bifins are light and powerful, but they are also available in several hardnesses to suit swimmers’ individual preferences. Powerfins fiberglass or carbon bifins are available with a 35/45 mm liner between the bottom of the thumb and the blade material. This option allows swimmers to customize the comfort and performance of their fins.

Flat slippers for training

Powerfins monofins with flat liners are designed for training. They are more comfortable and easier to use than monofins with inclined booties. Flat liners also provide good stability and control.

Sloped liner for high performance

Powerfins monofins with angled booties are designed for high performance. They offer better propulsion than monofins with flat shoes. Inclined booties also allow swimmers to generate more force with their legs.

Powerfins monofins are popular with freedivers for several reasons:

  • They provide powerful and efficient propulsion. Powerfins monofins are designed to provide maximum thrust, allowing freedivers to move faster and easier underwater.
  • They are comfortable and durable. Powerfins monofins are made from high-quality materials that provide optimal comfort and durability.
  • They are available in a variety of sizes and hardnesses. Freedivers can choose the monofin that suits them based on their size and level of experience.

In particular, Powerfins carbon monofins are very popular with elite freedivers. They are light and rigid, which allows freedivers to generate maximum propulsion without tiring their muscles.

Most members of the French freediving team use Powerfins monofins. Among them, we find Morgan Bourc’his, Guillaume Néry, Frédéric Sessa, Alexis Duvivier, Stéphane Tourreau, Arthur Guerin Boeri, Guillaume Bourdilat as well as the Japanese women’s team, world champions of AIDA 2012 in Nice.

The hardness of Powerfins monofins ranges from 1 to 5, with 1 being the softest and 5 being the stiffest. Most elite freedivers do not exceed hardness 3.

In conclusion, Powerfins monofins are an excellent choice for freedivers of all levels. They offer powerful propulsion, optimal comfort, and exceptional durability.

Your orders on

We do not offer exchanges for purchases made on If you want to find a new product, the easiest way is to return your recent purchase within the next 30 days and place a new order for the item of your choice.

  • Items ordered on can be returned up to 30 days after the original delivery date (Return costs payable by the customer).
  • Refunds are issued in the same manner as the original payment. POwerfins will refund the full value of the item purchased in the same manner as was paid for, less shipping costs.
  • Processing of refunds may take between 5 and 7 business days after receipt of the item at our warehouse.
  • Items must be returned in their original packaging.
  • All items purchased elsewhere than on must be returned to their original place of purchase.

Canceling an order is the last thing we want to do, but it may be necessary for some of these common reasons.

Orders that do not comply with our terms and conditions may be canceled without prior notice.

If you cancel your order, you will not be charged any fees, and any outstanding fees will also be waived.

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Whatever payment method you choose, you can be sure that your information is secure.


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