Some clueless frog with absolutely no diving experience wrote:

As for terminology, his big heavy black US Divers fins are branded
"rocketfins" he said derisively since he paid extra for them when he was
taking the dive class, only to find out later while diving that a fin is a
fin is a fin.

Yeah, right. So, lets start at the beginning. A 1 foot long fin used for
body surfing is exactly as functional as a three foot long fin used for free
diving and spearfishing?

Is that what you're saying, Lassie?

Steve

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A fool shows his annoyance at once, but a prudent man overlooks an insult.