This is the Cressi Reaction EBS Scuba Diving Open Heel Adjustable Fins with new ABS Bungee Straps.

Features:

• New generation technical polypropylene that is a lot more reactive, flexible and trim
• The blade is very long and has been designed specifically to get the best effort-propulsion ratio
• The blade runs right along the side of the foot and has a useful surface area of 20% more than traditional blades
• The blade gets progressively thinner towards the end to guarantee more extensive and regular bending when in stride
• Side frames are made from two separate materials that alternate and overlap in the different zones for a controlled flexibility structure in the various zones of the blade
• The computer-designed foot is made completely from soft elastomers for exceptionally comfortable and firm housing of the foot, to guarantee excellent transmission of the leg-fin effort
• The wide-soled foot makes it easy to remove the foot from the fin
• Foot provides excellent non-slip action, very useful when putting fins on in the dry and when departing from boats or from the shore
• Quick-release tilting buckles make it easy to find the perfect position for the strap on the heel
• A system to lock the buckles into place prevents them from accidentally unbuckling, even when the strap is unhooked

Cressi's most technically advanced fin, the Reaction uses a completely new polypropylene blade material that is more reactive, flexible and trim than previous designs. It kicks easily yet powerfully and is suitable for divers of every experience level. The new, longer blade efficiently transfers energy from the computer-designed foot pocket, and like other Cressi fins, the blade extends from the top of the foot pocket to maximize its effective surface area for more thrust. Other innovations include new locking strap buckles and no-slip material for better traction out of the water.

NEW EBS STRAP
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 despite the increase in hydrostatic pressure.