Fins are our method of propulsion and therefore one of the most relevant pieces of equipment for a spearo. An efficient fin will allow maximum performance for the user and allow the spearo to reach his operating depths with greater ease and comfort, even slightly increase the usual depth achieved.

We have opted to make a carbon fibre fin in medium to soft stiffness, which allows correct finning technique from the hip and an optimum flex of the blade.

Carbon fibre has proven to be the foremost material for the construction of spearfishing and freediving fins in the last decade, as its characteristics allow a very high percentage of energy returned from the finning action. To our knowledge, another key factor in the correct function of a fin is the deformation of the blade when the power of the leg is applied. Depending on the angle of flexion, the direction and amount of water channelled from the fin will vary. This is why we have opted for a specific size and stiffness.

The carbon used is just as important as the resin to manufacture the blade, its size and shape and the footpocket where the blade is mounted.

After trying various carbon weaves (of equal characteristics according to the provider) we have opted for the tighter weave pattern which has given better results that the other types used in testing. This carbon is more expensive and harder to find than the bigger weave.

The tapering of the carbon sheets throughout the blade allows an optimum flexion with minimal effort from muscles or strain on joints. The thickness of the blade decreases from the point of insertion in the footpocket becoming thinner at the tip.

The resin used in manufacturing has been the minimum amount possible as it decreases the response of the carbon. The surface of the blade is only covered very lightly with resin giving the impression that the blade is not made properly. Our brand has opted for an increase in performance even if it is not so aesthetically pleasing.

Another characteristic that influences the performance considerably is the shape and size of the blade. After testing various options we have selected a size and shape that allow a medium to wide cadence with a medium to high frequency. To maximise the performance of these fins the cadence must be Wide (from the hip) and the finning speed (frequency) medium to high.

To avoid slippage we have mounted 10cm guides on the tips of the blade and cut the end in the shape of a fish tail.

The rubber profiles also influence the performance of the carbon and why we have used low profile guides with a very elastic rubber to cover and protect the edges of the blades.

The last but not least point to consider is the selection of the footpocket on which we will mount the blades.

Depending on the stiffness of the side rails, the blade will flex in one way or another and vary the stiffness and push of the blade. Also the stiffness of the actual shoe section of the footpocket, will influence the correct transfer of energy and its important to find the right compromise between comfort and stiffness.

The blade adapts perfectly to various footpockets in the market. We recommend the blades are mounted on the new Picasso footpockets.