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Thor EBS
Brand new design for this extremely effective and yet very easy to use fin. The special arched profile of the fins combined with the two central ribs promote a significant flow convection effect, known as “spoon effect”, which stabilises and boosts propulsion.
Two lateral holes discharge the negative forces typically associated with this area and at the same time make for enhanced stability.
The blades are moulded from two different materials for improved reactivity.
These fins are perfect for scuba diving, whether you are an experienced diver or a novice.
EBS Elastic Strap Sistem (take a look at TECHNICAL FEATURES) 
EBS ELASTIC STRAP SYSTEM 
https://cressi.com/Catalogue/CressiTech.asp?id=1289&sez=1
Cressi has developed this special strap to meet the needs of the most demanding divers, who need a comfortable fastening for their foot but one that is still practical and manageable.
Its special amply sized slot makes it very easy to put on, even when wearing thick gloves or three-fingered gloves for winter water.
The wrapping section is highly flexible, making adjustments unnecessary, and as a result it’s much easier to get all your equipment right in the first few meters of your descent and the fin stays in place against your foot despiten the increase in hydrostatic pressure
Polypropylene of the high module: Especially reactive, it is applied to the nervaturas of the blade and is responsible for providing rigidity and return to the blade. This material connects the critical point of transmission of energy (the...
Foot pocket reinforced in the upper area by a supplementary thickness and laterally by two extensions of polypropylene from the upper to avoid the dispersion of energy in the process of transmission from the foot to the blade....
Polypropylene of the high module: Especially reactive, it is applied to the nervaturas of the blade and is responsible for providing rigidity and return to the blade. This material connects the critical point of transmission of energy (the instep) with the nerves in one piece, avoiding the usual loss of energy through excessively flexible components of the foot pocket that produce a heavy, slow and fatigue fluttering the instep .
Foot pocket reinforced in the upper area by a supplementary thickness and laterally by two extensions of polypropylene from the upper to avoid the dispersion of energy in the process of transmission from the foot to the blade.