C4 fins Umberto Pelizzari SIDERAL Soft

C4 fins Umberto Pelizzari SIDERAL Soft

Part of the SIDERAL freediving line, these fins come in striking silver blades. 

Umberto Pelizzari's name should be enough to describe these fins. Tens of thousands of hours spent training and an impressive series of World Records in Constant Weight make Umberto an absolute reference when it comes to knowledge and experience in the use of freediving equipment.

The new UP fins featuring technopolymer blades and 250 foot pockets are the result of the close collaboration between Umberto and C4. They were created by using the most recent plastic moulding technologies. Performance, which has always been a real obsession for Umberto, is at the basis of this project.

The 250 footpocket

The UP fins feature the new 250 footpocket - the latest evolution of the fin footpockets created by C4. Thanks to the use of a TPE 75 ShA polymer overmolded on a rigid sole, the 250 foot pocket transmits energy from the foot to the blade in the best possible way, resulting in highly efficient fins. The design of the geometries has allowed to use minimum thicknesses resulting in a reduction of the weight of the 250 footpocket in size 41/42 to just 250gr.

The reduced mass (weight) of the 250 footpocket minimises the energy required for movement, thus allowing the diver to save considerable energy and consequently reduce muscle fatigue. The connection between the foot pocket and the blade, thanks to the internal sole, is rigid and solid, and transmits the force to the blades efficiently.

The assembly of the blade on the footpocket without side horns, already created by C4 in 2006, allows an elastic bending of the blade along its entire length.

Advanced polymer blade

The best result is achievable only by combining a top quality footpocket with a highly performing blade. The new Umberto Pelizzari are designed with blades that put together all the elements needed: high quality materials, a futuristic design, advanced manufacturing and great mechanical resistance.

The design and material of the blade are key features to obtain both softness, high elastic return and strong resistance to breaking. C4 has selected and tested many different polymers, selecting two blends, one for the Soft version and one for the Medium stiffness blades. These two solutions guarantee extremely high performance and resistance.

The blade features a central smooth and glossy band which widens from the foot-pocket to the tip of the blade. On the sides, the surface feature a carbon fiber finish look. On the back side of the blade, the finish of the surface is exactly the opposite.

The tip of the blade is shaped as whale’s tail. The blade is 59 cm long at the center and 62.5 cm laterally. The measure takes into consideration the length from the tip of the foot-pocket to the end of the blade. The total maximum length of the blade is 79.5 cm, while the total maximum length of the fin, so including the foot-pocket, it is 91 cm.

Two long ribs are featured laterally on both surfaces of the blade, but they are 5 cm longer on the top side. On the back side of the blade there is an additional central nerve which runs almost all along the length of the blade. On the back surface, just before and after the tip of the foot-pocket, there are two 16 cm long ribs, 15 mm wide and 9 mm long, with an almost triangular section. The thickness in front of the foot-pocket is 3.4 mm, and goes down to 1.6 mm at the tip of the blade.

The angle of the blade is 29°, which added to the 3° angle of the C4 250 foot-pocket, brings the total angle to 32°.

A key element feature by the C4 Umberto Pelizzari fins is the fact that the water rails are over-moulded on the blades. The length (30.2* cm), the variable height (max 17.8* mm), the thickness (3.3* mm) and the material (thermo rubber) are another important feature of these blades. The result is a blade that works perfectly with no interference from the water rails and minimal lateral sliding of the fin.

Today the C4 Umberto Pelizzari fins are by far the lightest on the market of long polymer blade fins. They weigh less than 1200 grams a pair.

Specifications

• Blade Dimensions: 625×795 mm
  
• Fin Dimensions (42/43): 625×910 mm
  
• Fins angle: 32°
  
• Blade hardness: Medium, Soft
  
• Hardness recommendation:
  
  • Soft: weight under 85kg
    
  • Hard: weight under 85kg 
    
• Water Rails Color: White
  
• Water Rails Type: Progressive geometry. Overmoulded on the blades.
  
• Footpockets: 250
  
• Compatible with: All carbon blades of the MB series and UP (Umberto Pelizzari) technopolymer blades

Note: All C4 footpocket sizes are calculated to fit with a 3mm sock!