With the renewal of its production facility in Italy, near Genoa, Seac has boosted the production of polymer based products, among which definitely fins. We have already presented the beautiful and refined Seac Booster fins. Now it is time of a new upgrade from the Italian Company, the Seac BM30. These are surely candidates for the Award & Best Choice by Apneapassion. They can be indeed among the best spearfishing fins and freediving fins for beginners, but also intermediate practitioners.


The Seac foot-pocket has always been considered an excellent solution. Today in the BM30 version it has been updated with short lateral rails/ribs, which are the modern trend for spearfishing and freediving fins. This is today possible and needed as the materials of the fins’ blades are more and more performing. So the best solution is to let the blade bend and work with almost no interference by the foot-pocket. The reactivity and elastic return of the new materials is in fact so good that it was unthinkable only a few years ago. The BM30 foot-pocket itself is excellently finished in every detail and the perceived quality in amazing.

The foot-pocket is made with a double hardness rubber, 70 shore for ribs and sole (light grey), and 55 Shore for the upper part (black). Moreover, the foot-pocket is complete with differentiated thickness areas, especially on the foot instep, for more rigidity and capacity to transmit force from the foot to the blade. The angle of the foot-pocket is optimised to accommodate blades angled at 30°. The connection to the blade is traditional, with two screws on a plastic plate at the tip of the foot-pocket and two clips on the shortened lateral ribs. All these plastic elements are in a nice blu colour. The foot-pocket sizes available are well indicated in the chart below:

Seac BM30 footpocket sizes


The fins blade is the main revolution of these new Seac BM30, thanks to its material and its design.


Unique on the market according to Seac, the material of the blade is a light and reactive techno-polymer. It offers performance that was unthinkable with materials used only a few years ago. The reactivity and the elastic return are amazing. Seac even states that the blade completely folded returns completely to its straight position (we add, after some time). This means no permanent structural deformation would be generated that could compromise performance. All of this is thanks to the amazing shape memory of the techno-polymer.


Thanks to the blade of the Seac BM30 fins being inclined by 30°, surface finning is made easier. This is due to the fact that the blade is more naturally kept under the water surface. The position of the ankle during the dives is also more relaxed as the diver does not need to keep it in an extended flat position.

Together with the material, key is also the differentiated thickness profile of the blade. This is something that only recently has been seen on the market of polymer blade fins. Such design permits a much better flexion curve of the blade with greater efficiency of the kick and performance of the fins.

The water rails are one piece with the blade and are extremely small in dimensions (65 mm long x 5 mm high, with variable height). They are positioned in the point of greatest water flow, and so have the maximum effect. Even though small, they prevent the fin from drifting sideways without compromising the correct flexion of the blade. In addition to this, key to limit drifting is the V shape profile of the tail.

The aesthetic look is nice with two refined rough surface bands on the upper side of the blade.

Dimensions and weight

The Seac BM30 fins have a total maximum length, including the foot-pocket, of 90 cm (AP measure). The length of only the blade is 63 cm maximum from the curve under the foot-pocket to the tail. The total length of the blade is 76 cm. The maximum width of the blade is 21.5 cm, which is quite a high number. This can give good propulsion without the need of too long blades. It can though interfere in some cases, for some divers, with the kick as the blades will be very close one to the other.

The foot-pocket, size 43-44, without the clips and screws, weighs 440 grams, while the blade weighs 520 grams (AP measures).