Oh, I thought it was the legs
Honestly, I think the term might be French or Euskera, but not Spanish. I searched for escarpin thinking maybe it was a brand of fin socks or surf booties, not a generic term. Kept coming up with various forms of high heels. In the reference to the Hydro Tech 2, was curious about the comment on the fit, with and without booties, as Asier stated a bad fit without booties in one size and a great fit with 3mm booties the next swim fin size up. Which raises the question, "What kind of fin socks or booties are being used, e.g., wetsuit material fin socks or stiff sole standup surfboard booties?"
My two cents on Hydro Tech 2, great material, probably could go barefoot in warm waters, very soft and supple, and a wide and tall foot pocket. However, when I outfitted with 5 to 6mm of fin socks in a larger fitting size (I used Vipers for warmer waters), the fin provided no propulsion... I might was well have been in bare feet. This in one instance I think the fin blade could have benefited from an additional 2 to 3 inches of blade.
