1. Even when fully open, the strap keeps its original adjustment.
2. Simply press to close the lever. The foot is held in position.
3. Two-side adjustment for perfect heel piece centering.

Figure 1

Figure 2 - Traditional fin
The time taken by the fin to pass from one complete deformation to the start of the opposite deformation determines "zero efficiency" areas (with a minus sign in the diagram).
Figure 3 - Plana Avanti
The smaller the negative areas (dead angles), the larger the positive thrust area, i.e. the greater the thrust for the diver.

Figure 4
When water spills over the blade sides, it does not contribute to thrust and it decreases efficiency (fig.4). If appropriate channelling occurs, all the displaced water adds up to thrust. The Avanti fin line was designed to maximize fluid stream channelling. In particular, the Avanti line fins not only channel the displaced water perfectly but, if compared to other fins of similar size, they also displace a much greater water quantity.
 

The first four-channel fin in the world. The AVANTI concept (MARES patent) has taken a step forward: its four channels outperform traditional fin efficiency by 20%. Avanti Quattro fins feature blade stabilizers to improve kicking stability and get rid of any ankle-twisting phenomena. Rubberized side ribs (MARES patent) improve elasticity, thus maximizing resistance to cuts and abrasion. The inside of the anatomic foot-pocket features brand new ribs to improve fit and stiffen the sole. These ribs are made of Tecralene® in the same color as the blade. Straps come with the new ABS system. 

available in black/yellow,  black/blue, black/lime,  black/flamingo, black/gulf green, black/black metal

The most famous fin in the world,appreciated and used by the most demanding diverts its "channel effect" techno- logy conveys greater power with reduced effort. Its new, hydrodynamic design enhances
Plana Avanti's classic efficiency even further. The inside of the anatomic foot-pocket features the new internal ribs to improve fit and efficiency. The strap, featuring the ABS system, makes it easy to slip on and off the fin both in the water and on the surface and eliminates the risk of accidentally losing it.

available in black/yellow, black/blue, black/pink, black/lime, black/flamingo, black/gulf green,  black/black metal 

Rubberized Rib Edges. The edges of the side ribs, especially in long fins, are the areas undergiong the highest deformation, hence the greatest stress. By coating the rib edges with a special thermoplastic rubber, a more elastic and abrasion and crack-resistant material can be used in critical areas. In addition, this solution provides higher ribs, thus further improving water channeling, while maintaining equal blade stiffness.

A further development Plana Avanti, the fins that conquered the world.
Plana Avanti Tre closed foot-pocket, in soft thermoplastic rubber, offers the greatest performance and a very comfortable fit, so that booties are no longer necessary. The medium-size blade is a three-channel type; the central channel bending runs opposite to the side channels. Two blade stabilizers at the ends allow the best use of the energy applied, thus avoiding side slipping and ankle twisting movements The optimum efficiency of Plana Avanti Tre fins allows very long and effortless kicks and is particularly appreciated in fast thrusts or when full muscle power is needed.

available in black/yellow, black/blue, black/pink, black/lime, black/flamingo, black/gulf green, black/black metal 

The Plana Avanti HP model provides divers with unbeatable foot-pocket and channel thrust technology. The result is : superior comfort and performance.

available in black/yellow, black/blue, black/pink, black/lime, black/flamingo, black/black metal

Plana Avanti L foot-pocket fins are designed for particularly demanding divers. Paramount comfort and high performance for the divers who prefer to wear light boots or n boots at all. The "channel effect" design and long blade provide particularly high efficiency while requiring a reduced kicking effort. The blade is made of Tecralene and features rubberized ribs to maximize resistance to cuts and abrasion. The anatomic foot-pocket is very soft and Comfortable, ideal to counter foot fatigue even after many diving hours.

available in black/lime, black/black metal