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Indeed. An Australian swim gear brand, I believe. Website at Zoggs.Zoggs. That's a name!
And want a lower tear strength.Sporti version: Sporti Essential Training Swim Fins at SwimOutlet.com
Also available in silicone for those who can't stand rubber: Sporti Essential Silicone Swim Fins at SwimOutlet.com
As David Wilson already posted these short fins are used by long-distance swimmers to reinforce the muscles in their legs. It is not for sprint pool swimmers, but for swimmers of long distance in open waters, as Gregorio Paltrinieri - WikipediaMaybe @Angelo Farina can answer this. What purpose do those mini fins serve? I was a competitive swimmer and we never used them. Form is vital in competitive swimming and you don't use the same kick with fins as you would without so I would think it's counterproductive to spend pool time using them. You certainly don't need extra accessories for movement specific muscle strengthening, the enormous increase in drag as speed increases means sprint intervals serve that purpose quite well.
BTW, it's probably obvious, but Pomarańczowe/Niebieski means Orange/Blue and Czerwone/Niebieski means Red/Blue.